The word "these" in paragraph 2 refers to
A.A.
chemical substances
B.B.
industrial activities
C.C.
our daily lives
D.D.
excessive burning of fuel for cooking, driving
Đáp án và lời giải
Đáp án:A
Lời giải:
Dẫn chứng: .... releases a huge amount of chemical substances in the air every day; these pollute the air.