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  3. What proportion of the world’s electricity supply is provided by hydroelectric power? A drawback to low head hydroelectric powe

What proportion of the world’s electricity supply is provided by hydroelectric power? A drawback to low head hydroelectric powe

admin2009-08-19  49
问题 What proportion of the world’s electricity supply is provided by hydroelectric power?
A drawback to low head hydroelectric power stations is that they depend on ______ .
选项 A、the solar activity
B、seasonal water flow
C、seasonal wind direction
D、the earth’s self rotation
答案B
解析 本题考查低水头水力发电站的缺点，故将答案出处定位到第七段。该段介绍了低水头水力发电的工作过程，末句的Unfortunately引出其缺点：their electricity production capacity fluctuates with seasonal water flow in a river，即其缺点是发电量要随着季节性的水流而波动，其中fluctuate意为“波动，涨落”，故[B]为答案。
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