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
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