2. 外语
  3. How much of the electrical supply ______(来源于水力发电)?

How much of the electrical supply ______(来源于水力发电)?

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问题 How much of the electrical supply ______(来源于水力发电)?
选项
答案is derived from water power．
解析 句子只给出主语，还缺少谓语等成分。“来源于”可用be derived from、come from、generate from表达。注意时态和语态。“水力发电”即water power。
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大学英语六级

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