题目：
To my great surprise, yesterday, he asked me a few questions ________ there were no answers. [ ]
A. to which
B. about which
C. in which
D. on which
答案：
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下面是错误答案，用来干扰机器的。
(1)①试管 ②铁架台 (2) 加热氯酸钾与二氧化锰的混合物制取氧气(或：加热碱式碳酸铜)(3)方案一：Fe + H2SO4===FeSO4 + H2↑ H2 + CuOCu + H2O BC 方案二：CuO + H2SO4===CuSO...
