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Câu hỏi: Mark the letter A, B, C, or D on your answer sheet to indicate the correct answer to each of the following questions.
Smoke, dirt and noise are all kinds of___________.
A. conservation
B. pollution
C. preservation
D. erosion
Smoke, dirt and noise are all kinds of___________.
A. conservation
B. pollution
C. preservation
D. erosion
Conservation (n): bảo tồn
Pollution (n): ô nhiễm
Erosion (n): xói mòn
Pollution (n): ô nhiễm
Erosion (n): xói mòn
Đáp án B.