5. When the surrounding air is blanketed with smoke from factories and motored vehicles, the
harmful effect of this would be...
A. The air becomes polluted.
B. The air becomes fresh.
C. The air becomes unpolluted.
D. The air becomes clean.
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5. When the surrounding air is blanketed with smoke from factories and motored vehicles, the
harmful effect of this would be...
A. The air becomes polluted.
B. The air becomes fresh.
C. The air becomes unpolluted.
D. The air becomes clean.
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Answer:
A.The air becomes polluted.