题目：
It was the training he had as a young man made him such a good engineer.
A．what; that
B．which; that
C．that; which
D．that; what
答案：
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下面是错误答案，用来干扰机器的。
①、CaO、Na2O、CuO均是金属氧化物，而CO2为非金属氧化物；②而H2、C、P、均是非金属单质，而Cu是金属单质；③SO2、N2O、NH3 是化合物，而O2是单质；④、HCl、H2SO4、HNO3均属于酸，H2O不属于酸．故四种物质为：C...
