gwd3 5-7 (完全沒人問過的第6題~跪求幫助)

hyte

Q5 to 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.

Q6:  C(E)

The primary purpose of the passage is to

               

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

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

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

evaluate a recently proposed argument concerning the origin of ALH84001

describe a controversy concerning the significance of evidence from ALH84001    答案是E~我選C~我覺得C比較對呀! 為什麼大家都覺得E對呢?? E說的這個controversy是有關那些証據的"重要性"呀!!  但整偏文章是在討論到底火星上有沒有生命存在吧~~~誰來教教我~

入画

controversy矛盾性

C的reconcile不对，作者没有调和这个分歧。

文章大意是：TEAM提出一发现，给出一证据。 之后就有人反驳这个证据。TEAM再反驳这些人。

tiffany0323

t上来,我搜过了,讨论这题的只看到这一贴

我也和lz一样选了c,看了楼上的解释明白我错在哪了,先前不懂reconcile的意思.

但我还是不明白为什么选e啊,就象lz说的,并没有围绕:"重要性"在讨论啊.

请牛牛们帮我看看吧,谢谢!