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What proportion of the world’s electricity supply is provided by hydroelectric power? When do high head power plants use surplu

admin2009-08-19  48
问题 What proportion of the world’s electricity supply is provided by hydroelectric power?
When do high head power plants use surplus electricity to transfer water to a second reservoir?
选项 A、In the morning.
B、At noon.
C、In the afternoon.
D、At night.
答案D
解析 本题考查高水头电站在何时将多余的发电量转换到第二个储备库中，故将答案出处定位到第六段。该段介绍了水力发电分为两种．并分两段对其进行具体介绍，此段介绍的是high head power plants的发电过程，倒数第二句提到：在电力系统过剩时，而这个过剩的时间通常是在晚上(At times of excess electrical system capacity, usually available at night)，其中surplus≈excess，由此可知，时间应是晚上，故[D]为答案。
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