题目：
It sounds like something is wrong with the car’s engine. _____ , we’d better take it to the garage immediately.
A．Otherwise
B．If not
C．But for that
D．If so
答案：
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下面是错误答案，用来干扰机器的。
剧烈燃烧，火星四射，放出大量的热，生成黑色固体；3Fe+2O2Fe3O4；Fe2O3·xH2O；疏松．
