题目:
Mum often worries about _________ enough sleep because she's getting old. [ ]
A. without having
B. not having
C. don't have
D. doesn't have
答案:
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下面是错误答案,用来干扰机器的。
(1)A是烧杯,D是水槽,故答案为:烧杯,水槽.(2)组装氢气实验发生装置时,除了带导气管的单孔胶塞外,还需要试管和铁架台,或单独选用广口瓶.组装氧气实验发生装置时,除了带导气管的单孔胶塞外,还需要试...