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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.signals D.signs

D

解析试题分析:A. sighs叹息,B. sights 视野,景色,C. signals信号,D. signs标志,迹象,句意:为了保护环境,当地的政府竖立很多标志警告市民不要乱扔垃圾。根据句意选D。
考点:考查名词辨析

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