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【GMAT逻辑CR】8810-OG16

浏览次数:173 日期:2017-05-17 15:05:27
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 __________.

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 j

 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


【申友解析】


正确答案:E


题干:虽然大型的轨道卫星在数量上比轨道中小型碎片少得多,但是大型卫星由于产生强烈反射,对于天文观测的影响更为严重。基于很多大型卫星基本上已经失去功能的事实,一个将失去功能的大型卫星爆破消除的提案被提出。这个提案,在思想上是有问题的,因为____
题目:补全逻辑
分析:引入他因解释型正向逻辑,我们要找的选项必须说明将大型在轨卫星爆破消除对天文观测不但无益反而有害。

选项A,很多停止工作的卫星会留在轨道里很多年,该选项给消除这些无用的在轨卫星提供了动机,逻辑方向错误。

选项B, 对大多数的实效在轨卫星进行维修在成本上是无法承受的,同A的问题很相似,逻辑方向相反。

选项C,之前并无有目的爆破在轨卫星的先例,同爆破对天文观测的影响无关,无关属性!

选项D,使天文观测不被轨道垃圾影响的唯一手段是用天文望远镜瞄准极高的地球轨道,同样是无关属性。

选项E,地球轨道上小颗粒物体的增加会产生一个反射空白带,使得很多重要的天文观测失去可能性。引入了爆破在轨卫星对天文观测负面影响的合理他因,正确!

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