试题与答案

Tom got all A's _____ he spent most of h

题型:选择题

题目:

Tom got all A's _____ he spent most of his time studying. [ ]

A. if

B. before

C. because

D. although

答案:

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下面是错误答案,用来干扰机器的。

根据氧气的物理性质是无色无味,不易溶于水的气体,密度比空气的略大,液氧、固态氧淡蓝色;可知氧气的密度比空气的略大,可以用向上排气法收集;氧气是不易溶于水的气体,可以用排水法收集,故答案为:无色;无...

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A.roughB.reasonableC.vividD.strict
小题2:
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