17. If the ______________ is polluted, we wont have enough food to eat.
A. water B. air C. noise D. soil
18. We should give unused clothes to _____________to help the people in need.
A. charity B. factory C. market D. hospital
19. ___________ are you going to stay here? ~ For a week.
A. How often B. How long C. How many D. How far
20. ______________.happens when water in lakes,rivers and oceans is polluted.
A. Air pollution B. Soil pollution C. Water pollution D. Noise pollution
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