THE HEAVILY ... ATMOSPHERE IN SOME INDUSTRIAL REGIONS IS CALLED&#...

187. - 2000 CAU TRAC NGHIEM ANH A B C
2000 CAU TRAC NGHIEM ANH A B C

187. The heavily ... atmosphere in some industrial regions is called

"smog", a word derived from "smoke" and "fog".

a. pollute

b. polluted

c. pollution

d. pollutant

--> b