2. 外语
  3. In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. ______ countries have worke

In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. ______ countries have worke

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问题 In 1961, NASA has encouraged studies of space-planes that could be built using existing technology.
______ countries have worked together to build the International Space Station.
选项
答案5
解析 第9段第3句中“A large part…from the US， Canada，Europe、Japan and Russia”
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大学英语六级

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