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Lots of the scientists in our country are working hard to ____the planet Mars .
A.coverB.searchC.discoverD. explore
D

试题分析:动词词义辨析。A覆盖;B搜寻;C发现;D探索;句意:我们国家的很多科学家都在努力工作致力于探索火星。根据句意说明D正确。
点评:动词的词义辨析要放在上下文的语境中进行,要注意上下文的语义的串联以及逻辑关系的推理,特别要注意一些动词的固定搭配以及动词的深层次的含义的区别。
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