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标题: 没怎么完全明白，求本题解题思路 [打印本页]

作者: lori 时间: 2005-11-18 14:23
标题: 没怎么完全明白，求本题解题思路

GWD6-Q40

Q40:

It is theoretically possible that bacteria developed on Mars early in its history and that some were carried to Earth by a meteorite. However, strains of bacteria from different planets would probably have substantial differences in protein structure that would persist over time, and no two bacterial strains on Earth are different enough to have arisen on different planets. So, even if bacteria did arrive on Earth from Mars, they must have died out.

The argument is most vulnerable to which of the following criticisms?

It fails to establish whether bacteria actually developed on Mars.

It fails to establish how likely it is that Martian bacteria were transported to Earth.

It fails to consider whether there were means other than meteorites by which Martian bacteria could have been carried to Earth.

It fails to consider whether all bacteria now on Earth could have arisen from transported Martian bacteria.

It fails to consider whether there could have been strains of bacteria that originated on Earth and later died out.

请帮忙分析一下，谢谢

作者: laihong 时间: 2005-11-18 17:32

我觉得答案为Ｄ，因为作者假设现在的所有的生物都起源于一个星球（no two bacterial strains on Earth are different enough to have arisen on different planets），而这个星球不是火星even if bacteria did arrive on Earth from Mars, they must have died out.．所以Ｄ与质疑其假设．

Ｅ不对在于，即使strains of bacteria that originated on Earth and later died out，但也不能说明bacteria developed on Mars ，因为它们有可能来自于其他星球呢

作者: lori 时间: 2005-11-18 22:30

恩，你说的对，谢谢，BTW，太厉害了，居然连我错选了哪个都分析出来了，

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