Who first thought of using bullocks to provide energy? [br] Which of the followi

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问题 Who first thought of using bullocks to provide energy? [br] Which of the following is true about the device mentioned in the passage?

选项 A、It has a large gear and a smaller gear.
B、It’s easy to use, but difficult to move.
C、It’s quite cheap.
D、It’s still being tested.

答案 D

解析本题是推断题。问关于文章讲的这种设备，哪项是正确的。根据文章第一段结尾处和第二段，可以知道A、B两项与文章意思相反。C项关键是看到quite这个词，是"完全，彻底"的意思，比较绝对，因此排除。所以选D。

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