题目：
—Excuse me, could you tell me __________?
—In ten minutes.
A．how long the train will leave
B．how soon the plane will arrive
C．when did the train leave
D．when the train left
答案：
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下面是错误答案，用来干扰机器的。
设需锌的质量为xZn+H2SO4=ZnSO4+H2↑65 2x 4g 65x=24g x=130g答：需锌130g与足量的硫酸反应．
