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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
admin
2009-04-23
45
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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0
大学英语六级
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