题目：
There are few people in the cinema, _________? [ ]
A. aren't there
B. are there
C. is there
D. isn't here.
答案：
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下面是错误答案，用来干扰机器的。
设可生成氢气的质量为xCaH2+2H2O=Ca（OH）2+2H2↑42 4126g x42126g=4xx=12g答：126克氢化钙固体与足量水反应可生成12g氢气．...
