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Passage 48
(The following is based on material written in 1996.)
The Montreal Protocol on Substances that Deplete the Ozone Layer, signed in 1987 by more than
150 nations, has attained its short-term goals:  it has decreased the rate of increase in amounts of
most ozone-depleting chemicals reaching the atmosphere and has even reduced the atmospheric
levels of some of them. The projection that the ozone layer will substantially recover from ozone
depletion by 2050 is based on the assumption that the protocol’s regulations will be strictly
followed. Yet  there is considerable evidence of violations, particularly in the form of the release of
ozone-depleting chlorofluorocarbons (CFC’s), which are commonly used in the refrigeration,
heating, and air conditioning industries. These violation reflect industry attitudes; for example , in
the United States, 48 percents of respondents in a recent survey of subscribers to Air Conditioning,
Heating, and Refrigeration News, and industry trade journal, said that they did not believe that
CFC’s damage the ozone layer. Moreover , some in the industry apparently do not want to pay for
CFC substitutes, which can run five times the cost of CFC’s. Consequently , a black market in
imported illicit CFC’s has grown. Estimates of the contraband CFC trade range from 10,000 to
22,000 tons a year, with most of the CFC’s originating in India and China, whose agreements
under the Protocol still allow them to produce CFC’s. In fact, the United States Customs Service
reports that CFC-12 is a contraband problem second only to illicit drugs.

illicit [i'lisit] adj. 违法的;不正当的
deplete [di'pli:t] vt. 耗尽,用尽;使衰竭,使空虚
protocol ['prəutəkɔl] n. 协议;草案;礼仪vt. 拟定vi. 拟定

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自然科学——环境
结论解释型
逻辑简图:。。。法案已经达到了短期目标:1。。。2。。。如果法案严格执行的话臭氧破坏情况会大大改善。但是这里有许多违背法案的地方,尤其是对CFC的释放。这些释放反映了工业态度:他们不相信CFC的破坏力,同时他们不愿意支付CFC的代替物。因此CFC的黑市产生。。。

信息题:
283. According to the passage, which of the following best describes most ozone-depleting
chemicals in 1996 as compared to those in 1987?
(A) The levels of such chemcials in the atmosphere had decreased.
(B) The number of such chemcials that reached the atmosphere had declined.
(C) The amounts of such chemcials released had increased but the amounts that reached the
atmosphere had decreased.
(D) The rate of increase in amounts of such chemicals reaching the atmosphere had
decreased.
(E) The rate at which such chemicals were being reduced in the atmoshphere had slowed.

错题/信息题:推断题
284. The author of the passage compares the smuggling of CFC’s to the illicit drug trade most
likely for which of the following reasons?
(A) To qualify a previous claim
(B) To emphasize the extent of a problem
(C) To provide an explanation for an earlier assertion
(D) To suggest that the illicit CFC trade, likely the illicit drug trade, will continue to increase
(E) To suggest that the consequences of a relatively little-knows problem are as serious as
those of a well-known one

信息题:
285. The passage suggests which of the following about the illicit trade in CFC’s?
(A) It would cease if manufacturers in India and China stopped producing CFC’s.
(B) Most people who participate in such trade do not believe that CFC’s deplete the ozone
layer.
(C) It will probably surpass illicit drugs as the largest contraband problem faced by the United
States Custom Services.
(D) It is fostered by people who do not want to pay the price of CFC substitutes.
(E) It has grown primarily because of the expansion of the refrigenration, heating, and
air-conditioning industries in foreign countries.

43 A 05:27
44 E 02:55
45 E 02:10
46 E 00:41
47 C 02:11
48 D 00:29


55 B 03:38
56 D 00:56
57 E 00:48
58 D 00:55
59 D 01:35
60 B 02:10

190 D 05:51
191 C 01:41
192 E 00:50
193 C 01:24
194 E 01:36
195 D 01:57
196 C 00:44
197 C 01:08


283 D 03:41
284 E 00:34
285D 01:03

错误率21%
超时率 21%
总时间没有超时

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Passage 2
Archaeology as a profession faces two major prob-
lems. First, it is the poorest of the poor. Only paltry
sums are available for excavating and even less is avail-
able for publishing the results and preserving the sites
(5) once excavated. Yet archaeologists deal with priceless
objects every day. Second, there is the problem of illegal
excavation, resulting in museum-quality pieces being
sold to the highest bidder.
I would like to make an outrageous suggestion that
(10) would at one stroke provide funds for archaeology and
reduce the amount of illegal digging. I would propose
that scientific archeological expeditions and govern-
mental authorities sell excavated artifacts on the open
market. Such sales would provide substantial funds for
(15) the excavation and preservation of archaeological sites
and the publication of results. At the same time, they
would break the illegal excavator’s grip on the market,
thereby decreasing the inducement to engage in illegal
activities.
(20) You might object that professionals excavate to
acquire knowledge, not money. Moreover, ancient arti-
facts are part of our global cultural heritage, which
should be available for all to appreciate, not sold to the
highest bidder. I agree. Sell nothing that has unique
(25) artistic merit or scientific value. But, you might reply,
everything that comes our of the ground has scientific
value. Here we part company. Theoretically, you may be
correct in claiming that every artifact has potential scien-
tific value. Practically, you are wrong.
(30) I refer to the thousands of pottery vessels and ancient
lamps that are essentially duplicates of one another. In
one small excavation in Cyprus, archaeologists recently
uncovered 2,000 virtually indistinguishable small jugs in
a single courtyard, Even precious royal seal impressions
(35) known as/melekh handles have been found in abun-
dance---more than 4,000 examples so far.
The basements of museums are simply not large
enough to store the artifacts that are likely to be discov-
ered in the future. There is not enough money even to
(40) catalogue the finds; as a result, they cannot be found
again and become as inaccessible as if they had never
been discovered. Indeed, with the help of a computer,
sold artifacts could be more accessible than are the
pieces stored in bulging museum basements. Prior to
(45) sale, each could be photographed and the list of the
purchasers could be maintained on the computer A
purchaser could even be required to agree to return the
piece if it should become needed for scientific purposes.
It would be unrealistic to suggest that illegal digging
(50) would stop if artifacts were sold on the open market.
But the demand for the clandestine product would be
substantially reduced. Who would want an unmarked
pot when another was available whose provenance was
known, and that was dated stratigraphically by the
professional archaeologist who excavated it?

7. The primary purpose of the passage is to propose
(A) an alternative to museum display of artifacts
(B) a way to curb illegal digging while benefiting the archaeological profession
(C) a way to distinguish artifacts with scientific value from those that have no such value
(D) the governmental regulation of archaeological sites
(E) a new system for cataloguing duplicate artifacts

8. The author implies that all of the following statements about duplicate artifacts are true EXCEPT:
(A) A market for such artifacts already exists.
(B) Such artifacts seldom have scientific value.
(C) There is likely to be a continuing supply of such artifacts.
(D) Museums are well supplied with examples of such artifacts.
(E) Such artifacts frequently exceed in quality those already catalogued in museum collections.

9. Which of the following is mentioned in the passage as a disadvantage of storing artifacts in museum basements?
(A) Museum officials rarely allow scholars access to such artifacts.
(B) Space that could be better used for display is taken up for storage.
(C) Artifacts discovered in one excavation often become separated from each other.
(D) Such artifacts are often damaged by variations in temperature and humidity.
(E) Such artifacts’ often remain uncatalogued and thus cannot be located once they are put in storage.

10. The author mentions the excavation in Cyprus (lines 31-34) to emphasize which of the following points?
(A) Ancient lamps and pottery vessels are less valuable, although more rare, than royal seal impressions.
(B) Artifacts that are very similar to each other present cataloguing difficulties to archaeologists.
(C) Artifacts that are not uniquely valuable, and therefore could be sold, are available in large quantities.
(D) Cyprus is the most important location for unearthing large quantities of salable artifacts.
(E) Illegal sales of duplicate artifacts are wide-spread, particularly on the island of Cyprus.

11. The author’s argument concerning the effect of the official sale of duplicate artifacts on illegal excavation is
based on which of the following assumptions?
(A) Prospective purchasers would prefer to buy authenticated artifacts.
(B) The price of illegally excavated artifacts would rise.
(C) Computers could be used to trace sold artifacts.
(D) Illegal excavators would be forced to sell only duplicate artifacts.
(E) Money gained from selling authenticated artifacts could be used to investigate and prosecute illegal excavators.

12. The author anticipates which of the following initial objections to the adoption of his proposal?
(A) Museum officials will become unwilling to store artifacts.
(B) An oversupply of salable artifacts will result and the demand for them will fall.
(C) Artifacts that would have been displayed in public places will be sold to private collectors.
(D) Illegal excavators will have an even larger supply of artifacts for resale.
(E) Counterfeiting of artifacts will become more commonplace.

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Passage 16
Traditionally, the first firm to commercialize a new
technology has benefited from the unique opportunity to
shape product definitions, forcing followers to adapt to a
standard or invest in an unproven alternative. Today, how-
( 5) ever, the largest payoffs may go to companies that lead in
developing integrated approaches for successful mass
production and distribution.
Producers of the Beta format for videocassette recorders
(VCR’s), for example, were first to develop the VCR com-
(10) mercially in 1975, but producers of the rival VHS (Video
Home System) format proved to be more successful at
forming strategic alliances with other producers and
distributors to manufacture and market their VCR format
Seeking to maintain exclusive control over VCR distri-
(15) bution. Beta producers were reluctant to form such alli-
ances and eventually lost ground to VHS in the compe-
tition for the global VCR market.
Despite Beta’s substantial technological head start and
the fact that VHS was neither technically better nor cheaper
(20) than Beta, developers of VHS quickly turned a slight early
lead in sales into a dominant position. Strategic alignments
with producers of prerecorded tapes reinforced the VHS
advantage. The perception among consumers that prere-
corded tapes were more available in VHS format further
(25) expanded VHS’s share of the market. By the end of the
1980’s. Beta was no longer in production.

95. The passage is primarily concerned with which of the
following?
(A) Evaluating two competing technologies
(B) Tracing the impact of a new technology by narrating
a sequence of events
(C) Reinterpreting an event from contemporary business
history
(D) illustrating a business strategy by means of a case
history
(E) Proposing an innovative approach to business
planning

96. According to the passage, today’s successful firms,
unlike successful firms in the past, may earn the greatest
profits by
(A) investing in research to produce cheaper versions of
existing technology
(B) being the first to market a competing technology
(C) adapting rapidly to a technological standard
previously set by a competing firm
(D) establishing technological leadership in order to
shape product definitions in advance of competing
firms.
(E) emphasizing the development of methods for the
mass production and distribution of a new technology.

97. According to the passage, consumers began to develop a
preference for VCR’s in the VHS format because they
believed which of the following?
(A) VCR’s in the VHS format were technically better
than competing-format VCR’s.
(B) VCR’s in the VHS format were less expensive than
competing-format VCR’s.
(C) VHS was the first standard format for VCR’s.
(D) VHS prerecorded videotapes were more available
than Beta-format tapes.
(E) VCR’s in the Beta format would soon cease to be
produced.

98. The author implies that one way that VHS producers
won control over the VCR market was by
(A) carefully restricting access to VCR technology
(B) giving up a slight early lead in VCR sales in order to
improve long-term prospects.
(C) retaining a strict monopoly on the production of
prerecorded videotapes.
(D) sharing control of the marketing of VHS-format
VCR’s
(E) sacrificing technological superiority over Betaformat
VCR’s in order to remain competitive in price.
99. The alignment of producers of VHS-format VCR’s with
producers of prerecorded videotapes is most similar to
which of the following?
(A) The alignment of an automobile manufacturer with
another automobile manufacturer to adopt a
standard design for automobile engines.
(B) The alignment of an automobile manufacturer with
an automotive glass company whereby the
manufacturer agrees to purchase automobile
windshields only from that one glass company
(C) The alignment of an automobile manufacturer with a
petroleum company to ensure the widespread
availability of the fuel required by a new type of
engine developed by the manufacturer.
(D) The alignment of an automobile manufacturer with
its dealers to adopt a plan to improve automobile
design.
(E) The alignment of an automobile dealer with an
automobile rental chain to adopt a strategy for an
advertising campaign to promote a new type of
automobile

100. Which of the following best describes the relation of the
first paragraph to the passage as a whole?
(A) It makes a general observation to be exemplified.
(B) It outlines a process to be analyzed.
(C) It poses a question to be answered.
(D) It advances an argument to be disputed.
(E) It introduces conflicting arguments to be reconciled.

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Passage 18
When A. Philip Randolph assumed the leadership of the
Brotherhood of Sleeping Car Porters, he began a ten-year
battle to win recognition from the Pullman Company, the
largest private employer of Black people in the United
(5) States and the company that controlled the railroad
industry’s sleeping car and parlor service. In 1935  the
Brotherhood became the first Black union recognized by a
major corporation. Randolph’s efforts in the battle helped
transform the attitude of Black workers toward unions and
(10) toward themselves as an identifiable group; eventually,
Randolph helped to weaken organized labor’s antagonism
toward Black workers.
In the Pullman contest Randolph faced formidable
obstacles. The first  was Black workers’ understandable
( 15) skepticism toward unions, which had historically barred
Black workers from membership. An additional obstacle
was the union that Pullman itself had formed, which
weakened support among Black workers for an
independent entity.
(20) The Brotherhood possessed a number of advantages,
however , including Randolph’s own tactical abilities. In
1928  he took the bold step of threatening a strike against
Pullman. Such a threat , on a national scale, under Black
leadership, helped replace the stereotype of the Black
(25)worker as servant with the image of the Black worker as
wage earner. In addition , the porters’ very isolation aided
the Brotherhood. Porters were scattered throughout the
country, sleeping in dormitories in Black communities;
their segregated life protected the union’s internal
(30) communications from interception. That the porters were a
homogeneous group working for a single employer with
single labor policy, thus sharing the same grievances from
city to city, also strengthened the Brotherhood and encour-
aged racial identity and solidarity as well. But  it was only
(35) in the early 1930’s  that federal legislation prohibiting a
company from maintaining its own unions with company
money eventually allowed the Brotherhood to become
recognized as the porters’ representative.
Not content with this triumph, Randolph brought the
(40)Brotherhood into the American Federation of Labor, where
it became the equal of the Federation’s 105 other unions.
He reasoned that as a member union, the Brotherhood
would be in a better position to exert pressure on member
unions that practiced race restrictions. Such restrictions
were eventually found unconstitutional in 1944.

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bold [bəuld] adj. 大胆的,英勇的;厚颜无耻的;险峻的;黑体的
mitigate ['mitiɡeit] vt. 使缓和,使减轻vi. 减轻,缓和下来
grievance ['ɡri:vəns] n. 不满,不平;委屈;冤情

社会现象——黑人
结论解释型
逻辑简图:第一段:R作为B的领导者与 P公司斗争了十年,R的努力有两方面成功:  
第二段:R在斗争中也面临着一些障碍:一个障碍是。。。。另一个是。。。。
第三段:但是,B(R)也有一些优势,一个优势是罢工。。。另一个优势是地理分隔。。。
第四段:补充R的成功

信息题
107. According to the passage, by 1935 the skepticism of
Black workers toward unions was
(A) unchanged except among Black employees of
railroad-related industries.
(B) reinforced by the actions of the Pullman Company’s
union
(C) mitigated by the efforts of Randolph
(D) weakened by the opening up of many unions to
Black workers.
(E) largely alleviated because of the policies of the
American Federation of Labor.

作者态度题
108. In using the word “understandable” (line 14), the
author most clearly conveys
(A) sympathy with attempts by the Brotherhood
between 1925 and 1935 to establish an independent
union.
(B) concern that the obstacles faced by Randolph
between 1925 and 1935 were indeed formidable
(C) ambivalence about the significance of unions to
most Black workers in the 1920’s.
(D) appreciation of the attitude of many Black workers
in the 1920’s toward unions.
(E) regret at the historical attitude of unions toward
Black workers.

信息题:推测题
109. The passage suggests which of the following about the
response of porters to the Pullman Company’s own
union?
(A) Few porters ever joined this union.
(B) Some porters supported this union before 1935.
(C) Porters, more than other Pullman employees,
enthusiastically supported this union.
(D) The porters’ response was most positive after 1935.
(E) The porters’ response was unaffected by the general
skepticism of Black workers concerning unions.

错题/强对比取非题:注意定位以及与原文信息的匹配
110. The passage suggests that if the grievances of porters in
one part of the United States had been different from
those of porters in another part of the country, which of
the following would have been the case?
(A) It would have been more difficult for the Pullman
Company to have had a single labor policy.
(B) It would have been more difficult for the
Brotherhood to control its channels of
communication.(原文是保护交流不被打扰,另外这一点是与前面地理分隔有关,与greivance无关)
(C) It would have been more difficult for the
Brotherhood to build its membership.
(D) It would have been easier for the Pullman
Company’s union to attract membership.
(E) It would have been easier for the Brotherhood to
threaten strikes.

强对比取非题
111. The passage suggests that in the 1920’s a company in
the United States was able to
(A) use its own funds to set up a union
(B) require its employees to join the company’s own
union
(C) develop a single labor policy for all its employees
with little employee dissent.
(D) pressure its employees to contribute money to
maintain the company’s own union
(E) use its resources to prevent the passage of federal
legislation that would have facilitated the formation
of independent unions.
信息题
112. The passage supplies information concerning which of
the following matters related to Randolph?
(A) The steps he took to initiate the founding of the
Brotherhood
(B) His motivation for bringing the Brotherhood into the
American Federation of Labor
(C) The influence he had on the passage of legislation
overturning race restrictions in 1944
(D) The influence he had on the passage of legislation to
bar companies from financing their own unions
(E) The success he and the Brotherhood had in
influencing the policies of the other unions in the
American Federation of Labor

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Passage 27
Until recently, scientists did not know of a close verte-
brate analogue to the extreme form of altruism observed in
eusocial insects like ants and bees, whereby individuals
cooperate, sometimes even sacrificing their own oppor-
( 5) tunities to survive and reproduce, for the good of others.
However , such a vertebrate society may exist among under-
ground colonies of the highly social rodent Heterocephalus
glaber, the naked mole rat.
A naked mole rat colony, like  a beehive, wasp’s nest, or
(10) termite mound, is ruled by its queen, or reproducing
female. Other adult female mole rats neither ovulate nor
breed. The queen of the largest member of the colony, and
she maintains her breeding status through a mixture of
behavioral and, presumably, chemical control. Queens have
(15) been long-lived in captivity, and when they die or are
removed from a colony one sees violent fighting for breed-
ing status among the larger remaining females, leading to a
takeover by a new queen.
Eusocial insect societies have rigid caste systems, each
(20)insects’s role being defined by its behavior,body shape, and
physiology. In naked mole rat societies, on the other hand,
differences in behavior are related primarily to reproductive
status (reproduction being limited to the queen and a few
males), body size, and perhaps age. Smaller nonbreeding
(25) members, both male and female, seem to participate pri-
marily in gathering food, transporting nest material, and
tunneling. Larger nonreaders are active in defending the
colony and perhaps in removing dirt from the tunnels.
Jarvis’ work has suggested  that differences in growth rates
(30)may influence the length of time that an individual performs
a task, regardless of its age.
Cooperative breeding has evolved many times in verte-
brates, but unlike naked mole rats , most cooperatively
breeding vertebrates (except the wild dog, Lycaon pictus)
(35) are dominated by a pair of breeders rather than by a single
breeding female. The division of labor within social groups
is less pronounced among other vertebrates than among
naked mole rats, colony size is much smaller, and mating
by subordinate females may not be totally suppressed,
(40) whereas  in naked mole rat colonies subordinate females are
not sexually active, and many never breed.

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altruism ['æltruizəm] n. 利他;利他主义
captivity [kæp'tivəti] n. 囚禁;被关
caste [kɑ:st, kæst] n. (具有严格等级差别的)社会地位;
pronounced [prəu'naunst] adj. 断然的;显著的;讲出来的 v. 发音;宣告;断言(pronounce的过去分词)

自然科学——生物
结论解释型
逻辑简图:第一段:eusocial行为也有可能发生在脊椎动物rat
第二段:与。。。昆虫相同,rat的皇后。。。
第三段:昆虫的角色是由。。。。决定的,rat的角色是由。。。决定的
第四段: 与其他脊椎动物不同,rat的协作繁殖是由个体进行的,劳动力分割也不同。。。

主题题:
160. Which of the following most accurately states the main
idea of the passage?
(A) Naked mole rat colonies are the only known
examples of cooperatively breeding vertebrate
societies.
(B) Naked mole rat colonies exhibit social organization
based on a rigid caste system.
(C) Behavior in naked mole rat colonies may well be
a close vertebrate analogue to behavior in eusocial
insect societies.
(D) The mating habits of naked mole rats differ from
those of any other vertebrate species.
(E) The basis for the division of labor among naked
mole rats is the same as that among eusocial insects.

信息题:考人物观点
161. The passage suggests that Jarvis’ work has called into
question which of the following explanatory variables
for naked mole rat behavior?
(A) Size
(B) Age
(C) Reproductive status
(D) Rate of growth
(E) Previously exhibited behavior

信息题:推测
162. It can be inferred from the passage that the performance
of tasks in naked mole rat colonies differs from task
performance in eusocial insect societies in which of the
following ways?
(A) In naked mole rat colonies, all tasks ate performed
cooperatively.
(B) In naked mole rat colonies, the performance of
tasks is less rigidly determined by body shape.
(C) In naked mole rat colonies, breeding is limited to
the largest animals.
(D) In eusocial insect societies, reproduction is limited
to a single female.
(E) In eusocial insect societies, the distribution of
tasks is based on body size.

信息题:推测题
163. According to the passage, which of the following is a
supposition rather than a fact concerning the queen in a
naked mole rat colony?
(A) She is the largest member of the colony.
(B) She exerts chemical control over the colony.
(C) She mates with more than one male.
(D) She attains her status through aggression.
(E) She is the only breeding female.

强对比取非题:考()
164. The passage supports which of the following inferences
about breeding among Lycaon pictus?
(A) The largest female in the social group does
not maintain reproductive status by means of
behavioral control.
(B) An individual’s ability to breed is related primarily
to its rate of growth.
(C) Breeding is the only task performed by the breeding
female.
(D) Breeding in the social group is not cooperative.
(E) Breeding is not dominated by a single pair of dogs.

错题/信息题:一定注意选项与原文部分相同,但是意思却相反,仔细读!!!
165. According to the passage, naked mole rat colonies may differ from all other known vertebrate groups in which
of the following ways?
(A) Naked mole rats exhibit an extreme form of altruism.
(B) Naked mole rats are cooperative breeders.
(C) Among naked mole rats, many males are permitted to breed with a single dominant female.(错误!原文是其他脊椎动物是由两个个体完成的繁殖,而rat是有单个个体完成的)
(D) Among naked mole rats, different tasks are performed at different times in an individual’s life.
(E) Among naked mole rats, fighting results in the selection of a breeding female.

错题/段落作用题:第三段虽然内容是rat与昆虫类的角色决定因素的对比,但是注意第一段主题是rat与昆虫类相同都是eusocial,所以段落作用题一定不要脱离主题存在
166. One function of the third paragraph of the passage is to
(A) state a conclusion about facts presented in an earlier paragraph
(B) introduce information that is contradicted by information in the fourth paragraph
(C) qualify the extent to which two previously mentioned groups might be similar
(D) show the chain of reasoning that led to the conclusions of a specific study
(E) demonstrate that, of three explanatory factors offered, two may be of equal significance


7 B 03:02
8 E 00:29
9 E 00:55
10 C 01:03
11 A 01:09
12 C 01:42

95 D 02:52
96 E 00:33
97 D 00:29
98 D 00:29
99 C 01:15
100 D 00:53

107 C 06:13
108 D 01:02
109 B 03:31
110 B 02:50
111 A 01:24
112 B 02:13

160 C 04:43
161 B 01:06
162 B 02:57
163 B 03:37
164 E 00:49
165 C 00:45
166 D 02:42

错误率16%
超时率28%
总时间没有超时

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Passage 6
In the two decades between 1910 and 1930, over
ten percent to the Black population of the United States
left the South, where the preponderance of the Black
population had been located, and migrated to northern
(5) states, with the largest number moving, it is claimed,
between 1916 and 1918. It has been frequently assumed,
but not proved, that the majority of the migrants in
what has come to be called the Great Migration came
from rural areas and were motivated by two concurrent
(10) factors: the collapse of the cotton industry following
the boll weevil infestation, which began in 1898, and
increased demand in the North for labor following
the cessation of European immigration caused by the
outbreak of the First World War in 1914. This assump-
(15) tion has led to the conclusion that the migrants’ subse-
quent lack of economic mobility in the North is tied to
rural background, a background that implies unfamil-
iarity with urban living and a lack of industrial skills.
But the question of who actually left the South has
(20) never been rigorously investigated. Although numerous
investigations document an exodus from rural southern
areas to southern cities prior to the Great Migration.
no one has considered whether the same migrants then
moved on to northern cities. In 1910 over 600,000
(25) Black workers, or ten percent of the Black work force,
reported themselves to be engaged in “manufacturing
and mechanical pursuits,” the federal census category
roughly encompassing the entire industrial sector. The
Great Migration could easily have been made up entirely
(30) of this group and their families. It is perhaps surprising
to argue that an employed population could be enticed
to move, but an explanation lies in the labor conditions
then prevalent in the South.
About thirty-five percent of the urban Black popu-
(35) lation in the South was engaged in skilled trades. Some
were from the old artisan class of slavery-blacksmiths.
masons, carpenters-which had had a monopoly of
certain trades, but they were gradually being pushed
out by competition, mechanization, and obsolescence,
(40) The remaining sixty-five percent, more recently urban-
ized, worked in newly developed industries---tobacco.
lumber, coal and iron manufacture, and railroads.
Wages in the South, however, were low, and Black
workers were aware, through labor recruiters and the
(45)Black press, that they could earn more even as unskilled
workers in the North than they could as artisans in the
South. After the boll weevil infestation, urban Black
workers faced competition from the continuing influx
of both Black and White rural workers, who were driven
(50) to undercut the wages formerly paid for industrial jobs.
Thus, a move north would be seen as advantageous
to a group that was already urbanized and steadily
employed, and the easy conclusion tying their subse-
quent economic problems in the North to their rural
background comes into question.

31. The author indicates explicitly that which of the following records has been a source of information in her
investigation?
(A) United States Immigration Service reports from 1914 to 1930
(B) Payrolls of southern manufacturing firms between 1910 and 1930
(C) The volume of cotton exports between 1898 and 1910
(D) The federal census of 1910
(E) Advertisements of labor recruiters appearing in southern newspapers after 1910

32. In the passage, the author anticipates which of the following as a possible objection to her argument?
(A) It is uncertain how many people actually migrated during the Great Migration.
(B) The eventual economic status of the Great Migration migrants has not been adequately traced.
(C) It is not likely that people with steady jobs would have reason to move to another area of the country.
(D) It is not true that the term “manufacturing and mechanical pursuits” actually encompasses the entire industrial sector.
(E) Of the Black workers living in southern cities, only those in a small number of trades were threatened by obsolescence.

错题
33. According to the passage, which of the following is true of wages in southern cities in 1910?
(A) They were being pushed lower as a result of increased competition.
(B) They had begun t to rise so that southern industry could attract rural workers.
(C) They had increased for skilled workers but decreased for unskilled workers.
(D) They had increased in large southern cities but decreased in small southern cities.
(E) They had increased in newly developed industries but decreased in the older trades.

34. The author cites each of the following as possible influences in a Black worker’s decision to migrate north in the Great Migration EXCEPT
(A) wage levels in northern cities
(B) labor recruiters
(C) competition from rural workers
(D) voting rights in northern states
(E) the Black press

35. It can be inferred from the passage that the “easy conclusion” mentioned in line 53 is based on which of the following assumptions?
(A) People who migrate from rural areas to large cities usually do so for economic reasons.
(B) Most people who leave rural areas to take jobs in cities return to rural areas as soon as it is financially possible for them to do so.
(C) People with rural backgrounds are less likely to succeed economically in cities than are those with urban backgrounds.
(D) Most people who were once skilled workers are not willing to work as unskilled workers.
(E) People who migrate from their birthplaces to other regions of country seldom undertake a second migration.

36. The primary purpose of the passage is to
(A) support an alternative to an accepted methodology
(B) present evidence that resolves a contradiction
(C) introduce a recently discovered source of information
(D) challenge a widely accepted explanation
(E) argue that a discarded theory deserves new attention

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Passage 23
New observations about the age of some globular clusters in our Milky Way galaxy have cast doubt on a long-held
theory about how the galaxy was formed.  The Milky Way contains about 125 globular clusters (compact groups of
anywhere from several tens of thousands to perhaps a million stars) distributed in a roughly spherical halo around the
galactic nucleus. The stars in these clusters are believed to have been born during the formation of the galaxy, and so
may be considered relics of the original galactic nebula, holding vital clues to the way of the formation took place.
The conventional theory of the formation of the galaxy contends that  roughly 12 to 13 billion years ago the Milky
Way formed over a relatively short time (about 200 million years) when a spherical cloud of gas collapsed under the
pressure of its own gravity into a disc surrounded by a halo. Such a rapid formation of the galaxy would mean that
all stars in the halo should be very nearly the same age.
However , the astronomer Michael Bolte has found  considerable variation in the ages of globular clusters. One of the
clusters studied by Bolte is 2 billions years older than most other clusters in the galaxy, while another is 2 billion
years younger. A colleague of Bolte contends that  the cluster called Palomar 12 is 5 billion years younger than most
other globular clusters.
To explain  the age differences among the globular clusters, astronomers are taking a second look at “renegade”
theories. One such newly fashionable theory , first put forward by Richard Larson in the early 1970’s, argues that  the
halo of the Milky Way formed over a period of a billion or more years as hundreds of small gas clouds drifted about,
collided, lost orbital energy, and finally collapsed into a centrally condensed elliptical system. Larson’s conception of
a “lumpy and turbulent” protogalaxy is complemented by computer modeling done in the 1970’s by mathematician
Alan Toomre, which suggests that closely interacting spiral galaxies could lose enough orbital energy to merge into a
single galaxy.

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