2017OG CR 疑问

Sunsunshine · 发表于 2016-10-27 21:11:36

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 reflection 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 telescope launched into extremely high orbits around the Earth
(E) a great increased number of small particles in Earth’s orbit would result in a blanket of reflections that would make certain valuable telescope observations impossible

这道题在2016OG里也有啦~
重新看OG的时候对于D选项突然产生了疑问
原文的方案目的是：eliminate interference（也就是根除！消灭！）
D选项说了你唯一想达到这个目的的方法是使用“发射很远的telescope” 所以我把它理解为了：你怎么explode都没用，即使你都explode的了，你用的不是发射很远的telescope也白搭（相当于人家要的白菜，你非要给萝卜），所以方案是ill conceived的
这样的理解哪里错了呢？
楼主跑去看OG解释，结果OG对于D选项的解释：This is not a cogent reason for thinking the proposal to be ill-conceived. Even if the proposal will not eliminate all interference with ground based telescopes, it might still greatly reduce interference.
？？？大幅减少了interference，没有eliminate，那这个proposal不就是ill-conceived的吗(因为没有达到目的--- eliminate)？OG为什么会这么解释啊？D选项到底出错在哪里呢？

一脸懵逼 · 发表于 2016-10-27 21:40:12

看一下！

Bradz · 发表于 2016-10-27 22:58:03

这个proposal的目的是通过引爆卫星，消灭卫星对望远镜的影响。

D说想消灭残骸对望远镜的影响，只有把望远镜发射到天上去。那么，我们知道，即使proposal得到最好结果（即卫星被炸的什么都不剩），也不能够完全解决望远镜受到影响的问题（因为以前就存在的debris还在）。

但是，proposal的目的不是解决望远镜受影响的所有问题，而仅仅是解决卫星对望远镜的影响的问题。所以，D这个说法，首先，不能够说明proposal的手段不能达到proposal的目的；其次，也不能够说明这是个没有意义proposal，因为我们不能assume让望远镜完全interference-free才是唯一有意义的事情。。

Sunsunshine · 发表于 2016-10-27 23:25:28

Bradz 发表于 2016-10-27 22:58
这个proposal的目的是通过引爆卫星，消灭卫星对望远镜的影响。

D说想消灭残骸对望远镜的影响，只有把望远 ...

哇我的天呐豁然开朗~~感谢感谢 (*^ - ^*)

Bradz · 发表于 2016-10-27 23:44:52

Sunsunshine 发表于 2016-10-27 23:25
哇我的天呐豁然开朗~~感谢感谢 (*^ - ^*)

不客气，能把逻辑讲通也很开心

2017OG CR 疑问

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