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

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

admin2009-08-19  49
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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