China's first Mars probe，Yinghuo-1，is expected to be launched in the second half of this year and it will be the first time that China will ________ another planet．A.exploreB.researchC.discoverD.invent
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A解析考查动词词义辨析。根据句意判断选A，explore意为“探测，探究，勘探”。research“调查，研究”；discover“(首次)发现”；invent“发明”，均不符合题意。