Scientist are not sure about the ___________ of water on the Mars.A.occupationB.
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Scientist are not sure about the ___________ of water on the Mars.A.occupation | B.existence | C.demand | D.treasure |
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答案
B |
解析
词义辨析。occupation 职业,占有;existence存在,生存;demand要求,需要;treasure财富,财宝。句意:关于火星上水的存在科学家们不确定。选B。 |
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