What proportion of the world’s electricity supply is provided by hydroelectric power? The origin of hydroelectric power is the

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问题 What proportion of the world’s electricity supply is provided by hydroelectric power?
The origin of hydroelectric power is the ______ produced when water obeys the laws of gravity.

选项

答案kinetic energy

解析本题考查水力发电的原始能源，也就是转化为电力的能源。该段首句提到，Hydroelectric plants convert the kinetic energy within falling water into electricity，即水利发电站把水流落下产生的动能转换成电能，其中water obeys the laws of gravity对应falling water，故答案为kinetic energy。

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大学英语六级

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