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What steps should be taken to reduce the effect of noise pollution?
Answer variants:
Heavy vehicles
Silencers
loudspeakers
Ear drum
Ear plugs
a. On social, religious, and political occasions, strict guidelines should be set for the use of .
b. should be standard on all automobiles.
c. should not be allowed in residential areas.
d. should be worn by workers in noisy factories.
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