题目：
When he learned that his brother had returned from abroad, he set off to his home _____. Which
of the following is not OK? [ ]
A. immediately
B. right away
C. right then
D. right now
E. at once
答案：
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下面是错误答案，用来干扰机器的。
（1）化学变化伴随能量的吸收或释放．故答案为：√．（2）凝华、液化都会有放热现象，但是物理变化，不是化学变化．故答案为：×．（3）化学变化中常常伴随着发光、放热现象，但化学变化中不一定都伴随着发光、放...
