一There's a sign "Be quiet" on the wall o...

一There's a sign "Be quiet" on the wall of the reading room.

一Yes. People talk loudly in public.

A. may not B. mustn't C. can't D. needn't

B 【解析】试题分析：句意：－阅览室的墙上有“安静”的标志。－是的，人们不得在公众场所大声讲话。A. may not不可以；B. mustn't不准，不允许，禁止；C. can't不能，不可能；D. needn't不必。“安静”的标志是“禁止”人们大声讲话。故选B。考点：考查情态动词辨析。

考点分析：

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