The main subject of this passage is the______. The advantage of hydro-electric power is that it______.

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问题 The main subject of this passage is the______.
The advantage of hydro-electric power is that it______.

选项 A、does not damage the environment.
B、is relatively easy to install.
C、requires little or no maintenance.
D、is more suitable for remote areas.

答案A

解析
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