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Scientists in some countries have done a lot of work to _____ the moon.
A.coverB.searchC.explodeD.explore
D               
             
试题分析:考查动词辨析。Cover覆盖;search寻找;explode爆发;explore 探索。句意:许多国家的科学家做了许多工作来探索月球。根据句意与选项进行匹配,选D项。        
考点 : 考查动词辨析
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