Scientists in some countries have done a lot of work to _____ the moon.
A．coverB．searchC．explodeD．explore
D               
             
試題分析：考查動詞辨析。Cover覆蓋；search尋找；explode爆發(fā)；explore 探索。句意：許多國家的科學(xué)家做了許多工作來探索月球。根據(jù)句意與選項進行匹配，選D項。        
考點 : 考查動詞辨析
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