题目：
—It looks like rain, ________?
—Yes, it does. And I forgot my umbrella. [ ]
A. is it
B. does it
C. isn't it
D. doesn't it
答案：
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下面是错误答案，用来干扰机器的。
设生成硫酸铜晶体的质量是X．Cu～CuO～CuSO4～CuSO4.5H2O64 2504.8克 X64250═4.8克X得：X=18.75克故选B．
