请教OG-110

ellea58

我想请假各位XDJM们一道题.

OG #110

Robot satellites relay important comminications and identify weather patterns. Because the satellites can be repaired only in orbit, astronauts are needed to repair them. Without repairs, the satellites would eventually malfunction. Therefore, space flights carrying astronauts must continue.

(D) Repair of satellites requires heavy equippent,which adds to the amount of fuel needed to life a spaceship carrying astronauts into orbit.

(E) Technical obsolescence of robot satellites makes repairing them more costly and less practical than sending new, improved satellites  into orbit.

答案是E.我想问为什么答案E比答案D好.D的缺陷在哪里.多谢大家了.

mildsevens

我也比较疑惑,后来想想,可能是D没有建立于命题的直接关系.(比如,增加燃油需要提高成本,比发射新的卫星成本要高),所以结论成立的条件并没有被weaken,因此不选d.商榷.

ellea58

多谢你了,我好象有点觉悟了.以前老师好象说过,有些答案是模棱两可的,但是GMAT要求的是最佳答案.我想E是个能一次性解决所有问题的最佳方案.不论从成本还是效果上来看.谢谢你.我三月就要考了.

mildsevens

以下是引用ellea58在2005-2-8 12:53:00的发言：

多谢你了,我好象有点觉悟了.以前老师好象说过,有些答案是模棱两可的,但是GMAT要求的是最佳答案.我想E是个能一次性解决所有问题的最佳方案.不论从成本还是效果上来看.谢谢你.我三月就要考了.

客气了，我也三月考，一起努力！