The air we breathe has become so filled with pollutants that it can cause (65) _______ problems.
The air we breathe has become so filled with pollutants that it can cause (65) _______ problems.
A. pollution
B. health
C. preserving
D. dirty
A. pollution
Đáp án B
Health problem (n): vấn đề về sức khoẻ
Các đáp án còn lại:
A. pollution (n): ô nhiễm
C. (to) preserve (v): bảo quản
D. dirty (adj): bẩn