关于Scientistsarenotsure的百科

•  Scientistsarenotsureaboutthe

• 问题详情： Scientistsarenotsureaboutthe________ofwateronMars.A.occupation              B.existence                 C.demand                   D.treasure【回答】解析：选B。考查名词辨析。句意：科学家们还不能...
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