Unit 6 When was it invented? 基础知识练习题（含答案）

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人教版 九年级全册 Unit 6 基础知识练习题
一、单项选择
1.—Who________the computer
—Sorry, I've no idea. But it has changed the world greatly.
A.invented B.discovered C.made D.played
2.Some competitors from China always________new records at the Olympics. We are proud of them.
A.invent B.create C.discover D...