GWD 17-36

applebees

Q35 to Q37:

(This passage was excerpted from material

published in 1996.)

When a large body strikes a planet

or moon, material is ejected, thereby

creating a hole in the planet and a local

Line deficit of mass. This deficit shows up

(5) as a gravity anomaly: the removal of

the material that has been ejected to

make the hole results in an area of

slightly lower gravity than surrounding

areas. One would therefore expect that

(10) all of the large multi-ring impact basins

on the surface of Earth’s Moon would

show such negative gravity anomalies,

since they are, essentially, large holes

in the lunar surface. Yet data collected

(15) in 1994 by the Clementine spacecraft

show that many of these lunar basins

have no anomalously low gravity and

some even have anomalously high

gravity. Scientists speculate that early

(20) in lunar history, when large impactors

struck the Moon’s surface, causing

millions of cubic kilometers of crustal

debris to be ejected, denser material

from the Moon’s mantle rose up

(25) beneath the impactors almost imme-

diately, compensating for the ejected

material and thus leaving no low gravity

anomaly in the resulting basin. Later,

however, as the Moon grew cooler

(30) and less elastic, rebound from large

impactors would have been only partial

and incomplete. Thus today such

gravitational compensation probably

would not occur: the outer layer of

the Moon is too cold and stiff.

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Q35:

According to the passage, the gravitational compensation referred to in line 33 is caused by which of the following?

1. A deficit of mass resulting from the creation of a hole in the lunar surface
2. The presence of material from the impactor in the debris created by its impact
3. The gradual cooling and stiffening of the Moon’s outer layer
4. The ejection of massive amounts of debris from the Moon’s crust
5. The rapid upwelling of material from the lunar mantle

Answer: E

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Q36:

The passage suggests that if the scientists mentioned in line 19 are correct in their speculations, the large multi-ring impact basins on the Moon with the most significant negative gravity anomalies probably

1. were not formed early in the Moon’s history
2. were not formed by the massive ejection of crustal debris
3. are closely surrounded by other impact basins with anomalously low gravity
4. were created by the impact of multiple large impactors
5. were formed when the Moon was relatively elastic

Answer: A

为什么不是E（用绿色标出），我觉得A和原文相反啊（用红色标出）

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Q37:

Which of the following best describes the organization of the passage?

1. An anomalous finding is cited, the data used to support that finding are analyzed, and the finding is modified.
2. A theory about a phenomenon is introduced, data seeming to disprove that theory are analyzed, and the theory is rejected.
3. A phenomenon is described, a finding relating to the phenomenon is discussed, and a possible explanation for that finding is offered.
4. A debate among scientists regarding the explanation for a particular phenomenon is outlined, and one position in that debate is shown to be more persuasive.
5. The observation of an astronomical event is described, and two schools of thought about the explanation for that event are discussed.

Answer: C

asasasas1

我感觉36题，A和B好像都各自有理。

A好像和B是关联的。月球早期(A的说法）因为冲撞，所以crustal debris都冒出来（B的说法），所以large multi-ring impact basins所以没有形成。

E不行的原因是后来月球不elastic了，所以gravitational compensation不会发生。但是它没有讲到multi-ring impact basins的问题。

反正我这题没做对

bfghdggf

36.A

Later

however, as the Moon grew cooler

and less elastic, rebound from large

impactors would have been only partial

and incomplete. Thus today such

gravitational compensation probably

would not occur: the outer layer of

the Moon is too cold and stiff.

是一个因果关系:由于(AS)月亮变得越来越冷且没有弹性,导致从反弹物越小或仅仅部分,(THUS)重力补充不足.可以推出以前的负重力异常情况是不发生的.(以前月亮是有弹性且不冷的)

observer

36)

If the scientists are right, then their speculation can hold that gravity compensation made up the deficits of mass lost in a collision. In Line 33-36, it said such gravity compensation might not happen again, because the outer layer becomes cool and rigid. Therefore, any basins showing negative gravity must have happened after the outer layers became cool and rigid. So we can imply they couldn’t happen very earlier when the outer layers are elastic.

pite123

楼主是不是把with the most significant negative gravity anomalies 看成 gravitational compensation 或者类似的吧。反正是看反了。

问题问重量的负异常. 早期的月亮很有弹性，只能造成正异常后者没有异常的，后来老了硬了不行了，撞上了才没法进行重力补偿， 彩绘有负异常。