救命~

qianmenghe

Q15:

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 _______.

 

1. many nonfunctioning satellites remain in orbit for years
2. for satellites that have ceased to function, repairing them while they are in orbit would be prohibitively expensive

3. there are no known previous instances of satellites’ having been exploded on purpose
4. 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
5. 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

这题为什么不选B?????疯狂中...

johnyin

……b明显是支持而且无关嘛，在胡主席的贴里俺给你回了。

ashura

已知：1）人造卫星比其它天体的碎片对天文望远镜的干扰更大，因为它们反射更多的光线。2）很多人造卫星都已经不工作了。

计划：为了减少他们对天文望远镜的干扰，把不工作的卫星全都炸掉。

推理：这个计划恐怕不能成功，因为_______

思路：找到那个选项能说明，如果炸掉卫星还是可以干扰望远镜。

D。被炸掉卫星的细小碎片会在地球外面形成一道屏障，这样望远镜根本没法用了。 （正确！）

B。把卫星修好的费用贵得承受不起。（就算把卫星全修好了，他们一样影响望远镜的观察。原题没有说过，修好的卫星能有助于望远镜的观察）

qianmenghe

谢谢你啊~呵呵~

qianmenghe

谢谢呵呵~