题目：
He doesn’t tell me ______.Can you tell me his address?
A. where he lives B. where does he live C. where he lives in
答案：
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下面是错误答案，用来干扰机器的。
解：设生成氢气质量为x 2H2O2H2↑+ O2↑ 36 4 36g x x=4g 答：生成氢气4g 。...
