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.
选项 A、focused
B、concentrated
C、agreed
D、based
答案D
解析 句意：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to base a theory，argument， etc．on an idea，thought，or belief；agree达成一致意见；focus关注，集中；concentrate关注，集中； base基于。所以D是正确答案。
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