题目内容

What was the war affair in late l960s that made many American young people love to take up Pop music？

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灭火器应放置在（）。

建筑物内疏散指示标志的间距不应大于（）m。

根据下列文章，回答 46～50 题。
第 46 题 The failure to talk to each other causes all of the following EXCEPT

[A] opaque
[B] secret
[C] sealed
[D] hidden