Scientist are not sure about the ___________ of water on the Mars.
A．occupationB．existenceC．demandD．treasure
B
詞義辨析。occupation 職業(yè)，占有；existence存在，生存；demand要求，需要；treasure財(cái)富，財(cái)寶。句意：關(guān)于火星上水的存在科學(xué)家們不確定。選B。
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