ChaseDream

标题: 问个PREP [打印本页]

作者: jeannefq 时间: 2007-8-19 00:39
标题: 问个PREP

1. (24179-!-item-!-188;#058&000705)

Although fullerenes--spherical molecules made entirely of carbon--were first found in the laboratory, they have since been found in nature, formed in fissures of the rare mineral shungite. Since laboratory synthesis of fullerenes requires distinctive conditions of temperature and pressure, this discovery should give geologists a test case for evaluating hypotheses about the state of the Earth's crust at the time these naturally occurring fullerenes were formed.

Which of the following, if true, most seriously undermines the argument?

(A) Confirming that the shungite genuinely contained fullerenes took careful experimentation.

(B) Some fullerenes have also been found on the remains of a small meteorite that collided with a spacecraft.

(D) The naturally occurring fullerenes are arranged in a previously unknown crystalline structure.。

(E) Shungite itself is formed only under distinctive conditions.

ANS

不懂,NN们,翻译加解释下吧

作者: Drakedirect 时间: 2007-8-19 01:06
我在做这道题目的时候用了排除法排掉了其他四个选项。
文中的推理是：实验室中合成的fullerenes需要特殊的温度和压力，因而科学家们可以以此来推测自然生长得fullernes附近earth's crust的情况。
D说明自然界生长得fullerenes和人工合成的不同，因而自然界生长的fullernes需要的条件就可能与人工合成的fullerenes需要的条件不同，因而就无法推断出当时earth's crust的情况！

作者: HHB 时间: 2007-8-19 13:43
为什么B不对呢？

作者: yedeanboy 时间: 2007-8-23 04:25
这道题目太恶心了，其实正确选项说的不是和实验室的不同，而是这种结构是以前所不知道的。你得根据时间顺序来得到结构不同这个结论，然后再根据这个结论来选这个答案。因为实验在前，自然界发现f在后，所以发现时的f的结构以前不知道才能推出和实验室的结构不一样。靠，直接说两个结构不一样我就选它了，居然还绕那么大一个弯。而且也不能100%排除B阿。
B至少证明了一种可能性，地球上自然界的f是彗星带来地球的，而非地球土产，所以和丫地球的自身环境也没啥关系了。
感觉prep的逻辑题太……

欢迎光临 ChaseDream (https://forum.chasedream.com/)