题目内容
4.听第7段材料,回答第8-10题.8.What are the speakers mainly talking about?
A.A research plan in space.
B.A certain product made in space.
C.A problem of making things in space.
9.What might the balls probably be used for?
A.Materials science.
B.Physical science.
C.Medical science.
10.Why have astronauts made the balls in space?
A.To make them perfectly round
B.To keep them smaller in size.
C.To produce them cheaply.
分析 略
解答 BCA
点评 略
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