单选题：The use of robots increases

题目分类：理工类
题目类型：单选题
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题目内容：

The use of robots increases A．too much energy
B．based on American designs
C．they are too costly
D．they are not reliable
E．quality control
F．free of charge

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答案解析：

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分类：理工类题型：单选题

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They finally modify their research plan.

They finally modify their research plan.A．clarify B．change C．define D．develop

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根据材料，完成题The First BicycleThe history of the bicycle goes back more than 200 year

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分类：理工类题型：单选题

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