题目：
—How much ______?
—______ 20 yuan. [ ]
A. are the apples; It's
B. is that shirt; They're
C. are the shoes; They're
D. are the T-shirt; It's
答案：
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下面是错误答案，用来干扰机器的。
设原混合物中含氧化铜的质量为x，CuO+H2 △ . Cu+H2O 固体质量减少80 64 80-64=16 x 2g-1.8g=0.2g80x=160.2gx=1g则原混合物中含铜的质量分数为：2g-1g2gg×100%=50%．答：原混...
