Question

 .............. causes many breathing problems.

A. Polluted air

B. Fresh air

C. Polluting air

D. Fresher air

Answer 1

.............. causes many breathing problems.

A. Polluted air

B. Fresh air

C. Polluting air

D. Fresher air

Answer 2

 .............. causes many breathing problems.

A. Polluted air

B. Fresh air

C. Polluting air

D. Fresher air

Answer 3

 .......A....... causes many breathing problems.

A. Polluted air

B. Fresh air

C. Polluting air

D. Fresher air

Answer 4

A nha

Answer 5

A

Answer 6

A

Answer 7

Đáp án A nha.

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