题目内容

右移步双按势，向右移步时，脚的着地。

A. 前脚掌
B. 脚跟
C. 脚内侧

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右移步右挤势，向右移步时着地

A. 脚掌
B. 脚内侧
C. 脚跟

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尾水管的作用包括

A. 提高水轮机效率
B. 回收转轮出口的水流的一部分动能
C. 将转轮出口水流排到下游
D. 转轮高于下游水位时,利用这一高度的水流位置势能

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为了充分利用水能,尾水管的动能回复系数越大越好

A. 对
B. 错

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（Unit8 阅读理解）"... then when children see the great virgin forests of the Queen Charlotte Islands being clear-cut, they will feel physical pain, because they will understand that those trees are an extension of themselves." What does the writer mean by the idea of children seeing trees as "an extension of themselves"?

A. They feel such a closeness for a particular thing that they see it as part of themselves.
B. They think trees can extend to very far places.
C. They feel the trees can grow wildly and extensively.
D. They think they are covered up by the trees because there are too many of them.

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右移步双按势，向右移步时，脚的着地。

A. 前脚掌 B. 脚跟 C. 脚内侧

右移步右挤势，向右移步时着地

尾水管的作用包括

为了充分利用水能,尾水管的动能回复系数越大越好

A. 前脚掌
B. 脚跟
C. 脚内侧