题目：
– What’s the matter with Tommy?
– He is ____________.
– Oh, you can tell him to share worries with his friends and ____________.
A．in a bad mood ; cheer him up
B．in good mood; cheer himself up
C．in a bad mood; cheer himself up
D．in good moods ; cheer up him
答案：
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下面是错误答案，用来干扰机器的。
故答案为（1）实验中观察到的现象是：铜片上的白磷燃烧（冒白烟）而红磷不燃烧，水中白磷不燃烧，涉及到的化学反应方程式 4P+5O2 △ . 2P2O5，学生要熟练记忆此化学方程式．（2）烧杯中热水的作用是：使白磷达...
