2. 考研
  3. The passage is mainly about______. The major difficulty in developing space travel is that______.

The passage is mainly about______. The major difficulty in developing space travel is that______.

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问题 The passage is mainly about______.
The major difficulty in developing space travel is that______.
选项 A、there is no clear destination in space
B、it is too risky and expensive for people to go beyond the orbit
C、the current space propulsion systems can not meet the needs for the long space travel
D、there is not enough energy for spacecraft to gain velocity
答案C
解析 细节题。题意为："发展太空旅行主要困难是______"。根据第二段第三句(目前的飞船动力技术无法将探测器送到太阳系内遥远的地方)，可知选项"目前的飞船推进系统无法满足长距离太空旅行的需要"为正确答案。
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考研英语一

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