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

試題分析：A. sighs嘆息，B. sights 視野，景色，C. signals信號，D. signs標(biāo)志，跡象，句意：為了保護(hù)環(huán)境，當(dāng)?shù)氐恼Q立很多標(biāo)志警告市民不要亂扔垃圾。根據(jù)句意選D。
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