2. 外语
  3. Research should continue on controlled nuclear fusion, but no energy program should be premised on its existence until it has pr

Research should continue on controlled nuclear fusion, but no energy program should be premised on its existence until it has pr

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问题 Research should continue on controlled nuclear fusion, but no energy program should be premised on its existence until it has proved practical.(2002年中国人民大学考博试题)
选项 A、focused
B、concentrated
C、agreed
D、based
答案D
解析 本题意为“我们应该继续可控核聚变的研究，但不能将能源项目建立在其存在的基础上，除非其已被证明可行”。所以D项是正确答案。
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