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  3. What proportion of the world’s electricity supply is provided by hydroelectric power? Exploiting hydroelectric power resource c

What proportion of the world’s electricity supply is provided by hydroelectric power? Exploiting hydroelectric power resource c

admin2009-08-19  91
问题 What proportion of the world’s electricity supply is provided by hydroelectric power?
Exploiting hydroelectric power resource can cost billions of dollars, for hydroelectric plants normally have ______ .
选项
答案(very)high building costs
解析 本题考查开发水力发电花费巨资的原因，是对水力发电未来的展望，故将答案出处定位到末段。该段第三句提到Exploiting this resource would involve an investment of billions of dollars, since hydroelectric plants normally have very high building costs. 明确指出通常是因为修建成本很高，其中题干中的for=since，故答案为(very)high building costs。
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