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听下面5段对话或独白。每段对话或独白后有几个小题，从题中所给的A、B、C三个选项中选出最佳选项，并标在试卷的相应位置。听每段对话或独白前，你将有5秒钟的时间阅读各个小题；听完后，各小题将给出5秒钟的答题时间。每段对话或独白读两遍。 What did the woman’s husband use to be

A student at Beijing University.
B. A teacher at Beijing University.
C. A teacher at London University.

开车时你再小心也不为过。

高温消毒灭菌的主要作用机制是

A. 蛋白质凝固变性
B. 抑制脱氢酶活性
C. 破坏细菌的细胞膜
D. 与蛋白质氨基结合
E. 菌体溶解或破裂

It is reported that ______ (identify) flying objects were seen over New Jersey last night.