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.

选项 A、focused
B、concentrated
C、agreed
D、based

答案D

解析 本题意为“我们应该继续核扩散控制的研究,但不能将能源项目建立在其存在的基础上(前提下),除非已被证明可行”。premise作为及物动词,其意思是“提论,预述,假定”;agree的意思是“达成一致意见”;focus的意思是“关注,集中”;concentrate的意思是“关注,集中”:base的意思是“基于”。所以D是正确答案。
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