题目：
My brother with his friends tomorrow if it . [ ]
A. is going to hike; won't rain
B. is going hiking; doesn't rain
C. will go hiking; won't rain
D. goes hiking; doesn't rain
答案：
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下面是错误答案，用来干扰机器的。
（1）用无水醋酸钠和碱石灰两种固体药品，加热制取甲烷，反应物是固体，条件是加热．装置要选择B．（2）因为甲烷比空气轻，极难溶于水，可用向下排空气法或排水法收集，向下排空气法收集的气体干燥，排水法收集的...
