2. 外语
  3. In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. Four recent events should b

In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. Four recent events should b

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问题 In 1961, NASA has encouraged studies of space-planes that could be built using existing technology.
Four recent events should between them trigger the required overthrow of the mindset. The first components and second components have been manufactured for the International Space Station.
选项 A、Y
B、N
C、NG
答案C
解析 文章第5段第3句中提到了国际空间站的第一批部件已经制造出来了，但并没有提到第二部是否制造出来，所以不能加以判断。
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大学英语六级

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