GMAT逻辑题型练习（474）

2018-01-18 09:41

来源：新东方在线

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　　GMAT逻辑题目内容

　　Which of the following most logically completes the argument below?

　　Although the number of large artificial satellites orbiting the Earth is small compared to the number of small pieces of debris in orbit, the large satellites interfere more seriously with telescope observations because of the strong reflections they produce. Because many of those large satellites have ceased to function, the proposal has recently been made to eliminate interference from nonfunctioning satellites by exploding them in space. This proposal, however, is ill conceived, since _______.

　　A.many nonfunctioning satellites remain in orbit for years

　　B.for satellites that have ceased to function, repairing them while they are in orbit would be prohibitively expensive

　　C.there are no known previous instances of satellites' having been exploded on purpose

　　D.the only way to make telescope observations without any interference from debris in orbit is to use telescopes launched into extremely high orbits around the Earth

　　E.a greatly increased number of small particles in Earth's orbit would result in a blanket of reflections that would make certain valuable telescope observations impossible

　　正确答案：E

　　GMAT逻辑题目解析

　　【题目解析】：虽然与环绕地球轨道上的小块碎片的数目相比，环绕地球运转的大型人造卫星的数目小，但是大型卫星对于望远镜观测的干扰更严重，因为他们产生强烈的反射。因为许多这样的大型卫星已经停止运作，最近有建议提出将这些没有运作的大型卫星炸掉，以消除对于观测的干扰。然而这个建议是拙劣的，因为：

　　【选项解析】：

　　A选项让炸掉卫星的政策更合理，与文章观点相反。不运作的卫星呆在轨道上不离开，又对观测有影响，就需要炸掉。

　　B选项同上。修理成本太高，难以负担，还不如炸掉。

　　C选项没有对文章结论起到支持作用。没有先例不能说明不该炸掉卫星。

　　D选项说明有其他方式排除观测干扰，但是不能说明炸掉卫星的建议不合理，炸掉卫星也能起到排除干扰的作用。

　　E选项正确。直接说明炸掉卫星带来的小碎片可能对观测产生更严重的干扰，也就体现出为了排除干扰炸掉卫星是不合理的，不能达到期望的效果，反而更糟

　　D选项建议了其他方式，但没有就炸掉卫星所起的负面作用原因作出分析。

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