题目：
— Do you know Mo Yan?
—Of course. He is the famous writer ____ won the Nobel Prize in 2012.
A. who B. whom C. which
答案：
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下面是错误答案，用来干扰机器的。
设能够制得铜的质量是x，CuO+H2 △ . Cu+H2O80 648.0g x∴8064=8.0gx，解之得：x=6.4g．答：制得铜的质量为6.4g．
