A. landfills are smelly
B. landfills may pollute the water supply
C. it is difficult to find locations for landfills
D. usable materials are wasted in landfills
D
Dẫn chứng: Landfills may pollute the local water supply. Not to mention that all of that garbage stinks. Nobody wants to live next to a landfill. This makes it hard to find new locations for landfills.
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