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15.To protect the environment,the local government has put up a lot of ______ to warn the citizens not to litter the ground.(  )
A.sighsB.sightsC.signalsD.signs

分析 为了保护环境,当地政府竖起了很多标志警告市民不要乱扔垃圾.

解答 答案D选项A.sighs叹息;选项B.sights 视野,景色;选项C.signals信号;选项D.signs标志,迹象.根据句意可知,为了保护环境,当地政府竖起的能警告市民不要乱扔垃圾的东西应该是"标志".故选D.

点评 本题考查名词的词义辨析.做这类题时,要根据选项中每个名词的意思并结合句意,选择最佳答案.本题四个选项的词形很相似,要注意区别.

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