GMAT考试资料：GWD试题合集（五）.

　　以下将为正在备战GMAT考试的同学们整理一些经典的GMAT阅读试题，并分多个合集推出，希望能够为正在备考GMAT考试的考生提供或多或少的帮助。

　　3. GWD-3-Q5 to Q7火星陨石的化合物能够证明火星上有生命物质么

　　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. M的发现：火星上有生命

　　(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. 对M理论的怀疑

　　结论解释

　　逻辑简图：

　　1P: 1841, M study meteorite. Two years later, announced that evidence live exists….

　　2P: skepticism, however. For example….. skeptic’s strongest argument… yet M notes…

　　以上就是本期GMAT试题的所有内容，考生可以此为据并进行针对性的练习，逐步掌握GMAT阅读的解题规律及技巧，以达到迅速提高GMAT考试成绩的目的。 相关链接：

1.GMAT考试资料：GWD试题合集（四）

2.GMAT考试资料：GWD试题合集（三）

3.GMAT考试资料：GWD试题合集（二）

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