GWD-3--Q5-Q6

yaya06

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.

--------------------------------------------------------------------------------

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.
3. It has been questioned by some skeptics of the McKay team’s work.
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.

--------------------------------------------------------------------------------

Q6:

The primary purpose of the passage is to

1. describe new ways of studying the possibility that life once existed on Mars
2. revise a theory regarding the existence of life on Mars in light of new evidence
3. reconcile conflicting viewpoints regarding the possibility that life once existed on Mars
4. evaluate a recently proposed argument concerning the origin of ALH84001
5. describe a controversy concerning the significance of evidence from ALH84001

参考答案是5-B,6-E。

我都做错了，有大虾可以帮忙解释一下吗？ 谢谢先。

steedzhu

以下是引用yaya06在2005-7-18 0:17:00的发言：

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.

--------------------------------------------------------------------------------

Q5:

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

这个题目你先定位，绿色的定位，然后利用排除法做，黄色的是我认为可以排除的，然后只有B是正确的了。

1. It was initially proposed by the McKay team of scientists.肯定不是，Mc只是提出了一个新观点
2. It is not a matter of widespread scientific dispute.
3. It has been questioned by some skeptics of the McKay team’s work. 怀疑者不是Mc队伍里的把
4. It has been undermined by recent work on PAH’s. 怎么会削弱呢？
5. It is incompatible with the face that ALH84001 has been on Earth for 13,000 years. 说了在MArs上的

--------------------------------------------------------------------------------

Q6:

The primary purpose of the passage is to

还是用的排除法，我一般都是一个一个看选项，如果有绝对错误的就排除掉。

1. describe new ways of studying the possibility that life once existed on Mars介绍方法，文章就是介绍观点，没有提到方法的使用把
2. revise a theory regarding the existence of life on Mars in light of new evidence 应该是对新观点持正评价，这个显然是负评价了
3. reconcile conflicting viewpoints regarding the possibility that life once existed on Mars 调和，作者没有对两个观点进行调和把，基本上是一边倒，就是觉得新观点正确
4. evaluate a recently proposed argument concerning the origin of ALH84001 没有介绍起源把，就是利用了这个东西来分析MArs的生命起源
5. describe a controversy concerning the significance of evidence from ALH84001

参考答案是5-B,6-E。

我都做错了，有大虾可以帮忙解释一下吗？ 谢谢先。

这个文章我还没有做，所以刚刚现做的，我的思考过程基本就是这样，呵呵，和答案一致比较开心那！文章中的绿色就说明这些内容要重点看，其他就略看可以了