________（50）A.Don’t eat food in your car.B.Don’t
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________（50）
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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答案：D
空格前句说“不要越过别人肩膀读书”，选项D说“许多人在地铁上这样做，但它真的很令人讨厌”，与后句“它使人不舒服”一同对前句之建议进行解释。而且选项D 中关键词this在前句有指代对象，与后句中it的指代对象一致。