请教GWD-3-Q5 to GWD-3-Q7:一主题题

reirayanqing

GWD-3-Q5 to GWD-3-Q7:
     
                    In 1994, a team of scientists led


by David Mckay began studying the


meteorite ALH84001, which had been

Line
discovered in Antarctica in 1984.


(5)
Two years later, the McKay team

announced that ALH84001, which

scientists generally agree originated

on Mars, contained compelling evi-

dence that life once existed on Mars.


(10)
This evidence includes the discovery

of organic molecules in ALH84001,

the first ever found in Martian rock.

Organic molecules—complex, carbon-

based compounds—form the basis for


(15)
terrestrial life.
The organic molecules

found in ALH84001 are polycyclic aro-

matic hydrocarbons, or PAH’s.
When

microbes die, their organic material

often decays into PAH’s.


(20)

Skepticism about the McKay team’s


claim remains, however.
For example,


ALH84001 has been on earth for

13,000 years, suggesting to some

scientists that its PAH’s might have


(25)
resulted form terrestrial contamination.

However, McKay’s team has demon-

strated that the concentration of PAH’s

increases as one looks deeper into

ALH84001, contrary to what one would


(30)
expect from terrestrial contamination.

The skeptic’s strongest argument,

however, is that processes unrelated


to organic life can easily produce all

the evidence found by McKay’ steam,


(35)
                    
including PAH’s.
For example, star

formation produces PAH’s.
Moreover,

PAH’s frequently appear in other

meteorites, and no one attributes


their presence to life processes.


(40)
Yet McKay’s team notes that the

particular combination of PAH’s

in ALH84001 is more similar to the

combinations produced by decaying

organisms than to those originating

form nonbiological processes.

GWD-3-Q6:

The primary purpose of the passage is to

A        describe new ways of studying the possibility that life once existed on Mars

B        revise a theory regarding the existence of life on Mars in light of new evidence

C        reconcile conflicting viewpoints regarding the possibility that life once existed on Mars

D       evaluate a recently proposed argument concerning the origin of ALH84001

E       describe a controversy concerning the significance of evidence from ALH84001

答案是E，但是文中一直讨论得是火星上得证据究竟是不是能证明它上面有生命存在，哪里体现了concerning the significance of evidence from ALH84001？？

BTW，C是不是错在文章只有2个观点，一个支持火星有生命，一个反对，无众多观点，对不对？

louisehu

争论点不在viewpoints concerning the origin of ALH84001 上，在PAH上，而PAH证明ALH84001

cindytaurus

The passage asserts which of the following about the claim that ALH84001 originated on Mars?
A.    It was initially proposed by the McKay team of scientists.
B.    It is not a matter of widespread scientific dispute.
C.    It has been questioned by some skeptics of the McKay team’s work.
D.    It has been undermined by recent work on PAH’s.
E.    It is incompatible with the face that ALH84001 has been on Earth for 13,000 years.
答案选B...请牛人解答!

wyw1018

仔细分析一下觉得e对了.
第二段就是在讨论alh84001是否可以作为证据.首先质疑pah minght have resulted from terrestial contamination.然后替M反驳说the concentration of pha's increases as one looks deeper into alh84001.然后提出更强质疑strongest argument和moreover.在替M做一个小小的让步来削弱moreover的内容.
看看几个词的解释,
controversy: a serious argument about something that involves many people and continues for a long time
reconcile 肯定错了.reconcile:if you reconcile two ideas, situations, or facts, you find a way in which they can both be true or acceptable.
文章是对alh84001作为证据的可行性进行讨论,argument不准确.argument:a set of reasons that show that something is true or untrue, right or wrong. --不过对d我还没有形成很好的感觉,我开始就选了d

henryest

D. evaluate a recently proposed argument concerning the origin of ALH84001
                        
L6-8 Two years later, the McKay team announced that ALH84001, which scientists generally agree originated on Mars,
D 不正确的原因所在. no argument...

L6-8 Two years later, the McKay team announced that ALH84001, which scientists generally agree originated on Mars,
D 不正确的原因所在. no argument...

viviansecret

哪里体现了concerning the significance of evidence from ALH84001??

我也想问这个问题

还有大家看看Ｄ为什么不对？