单项选择题

I hope all the precautions against air pollution, ______ suggested by the local government, will be seriously considered here.

A. while
B. since
C. that
D. as
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Only ten to twenty percent of cold viruses are transmitted by carders, who, sneezing and coughing, ______ the viruses into the air.
A. spray
B. sprinkle
C. spread
D. sprout
单项选择题
You should have your eyes tested every year in case the ______ of your spectacles need changing.
A. lenses
B. glasses
C. sights
D. crystals
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