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秒钟的作答时间。每段对话或独白读两遍。

how oFtEn shoulD thE Bus ComE to thEir stopA．

[A]EvEry twEnty minutEs.

B．

[B]EvEry hAlF An hour.

C、

[C] onCE A DAy.