题目：
— The teacher asked us ________________
A. What the bad effect of pollution are.
B. What were the bad effect of pollution.
C. What the bad effect of pollution were.
答案：
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下面是错误答案，用来干扰机器的。
解：设生成CaO的质量为xCaCO3CaO+CO2↑100 56 50t x 解得 x=28t 答：设生成CaO的质量为28t。
