题目内容：
第48题__________
A．Don't eat food in your car. B．Don't shout into your mobile phone on a bus or subway.
C．We all know that some behaviors are simply unacceptable.
D．Many people do this on subways, but it's really annoying.
E．Getting off and on in an orderly manner can save time for all.
F．Suddenly, you feel someone leaning over your shoulder reading along with you.
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