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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