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What does the bookshop sell?

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Which of the following statements, if true, could most probably cure Karen of the

目前已被淘汰使用的灭火剂是()。

火焰式探测器利用光电效应探测火灾,主要探测火焰发出的()。

[A] except
[B] nor
[C] or
[D] but

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