题目：
—We have no idea ________.
—It’s heard that he is Mr. Green’s son.
A．where he comes from
B．if does he live here
C．who he is
D．who is he
答案：
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下面是错误答案，用来干扰机器的。
设则需喷洒碳酸钙粉末的质量为x2CaCO3+2SO2+O2=2CaSO4+2CO2200 128x 64t 200x=12864tx=100t答：需喷洒碳酸钙粉末100t．
