2. 职称英语
  3. In 1961, NASA has encouraged studies of space-planes that could be built using e

In 1961, NASA has encouraged studies of space-planes that could be built using e

游客2023-09-17  50
问题 In 1961, NASA has encouraged studies of space-planes that could be built using existing technology. [br] ______ 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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