Air pollution in US and Canadian cities is caused mostly by __________. A. clear-cutting forests for timber B. releasing emissions from vehicles and industry C. dumping runoff from farms into rivers D.

Air pollution in US and Canadian cities is caused mostly by __________.

A.
clear-cutting forests for timber
B.
releasing emissions from vehicles and industry
C.
dumping runoff from farms into rivers
D.
harvesting minerals from mines
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Air pollution in US and Canadian cities is caused mostly by __________. A. clear-cutting forests for timber B. releasing emissions from vehicles and industry C. dumping runoff f…

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