[求助]GWD-3-Q3

caplasing

我搜到了之前人问的……题目是一样的但问得东西不一样……扯来扯去我觉得还是新开一个好了……请大家包涵……

 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.

Q5:
                        

The passage asserts which of the following about the claim that ALH84001 originated on Mars?

             

1. It was initially proposed by the McKay team of scientists.
2. It is not a matter of widespread scientific dispute.（答案）
3. It has been questioned by some skeptics of the McKay team’s work.（我选的）

4. It has been undermined by recent work on PAH’s.
5. It is incompatible with the face that ALH84001 has been on Earth for 13,000 years.

我看了之前有大N解释说C中的skeptics可以被理解为从MKteam内部而来，因此不选C，但是我觉得B也非常不靠谱啊，我在文中实在看不出来，请大牛指点！谢谢！！！

caplasing

help~!up~ up~