[原创]请大家帮忙明确一个GWD的阅读答案

chase_2008

    

      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 from 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.


    

Q7:

    

The passage suggests that the fact that ALH84001 has been on
earth for 13,000 years has been used by some scientists to support which of the
following claims about ALH84001?

    

 

    

1. ALH84001
        may not have originated on Mars.
2. ALH84001
        contains PAH’s that are the result of nonbiological processes.
3. ALH84001
        may not have contained PAH’s when it landed on Earth.
4. The
        organic molecules found in ALH84001 are not PAH’s.
5. The
        organic molecules found in ALH84001 could not be the result of terrestrial
        contamination.

请问这个题目的答案是什么啊？

Whitney

(C) ALH84001
     may not have contained PAH’s when it landed on Earth.

(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 from terrestrial contamination.