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Câu hỏi:
(18) _____
- A. polluted
- B. unpolluted
- C. harmful
- D. all are incorrect
Lời giải tham khảo:
Đáp án đúng: B
Kiến thức: Từ vựng
Giải thích:
A. polluted (adj): ô nhiễm
B. unpolluted (adj): không ô nhiễm
C. harmful (adj): có hại
D. tất cả đều sai
It’s our responsibility to keep the air (18) unpolluted.
(Chúng ta có trách nhiệm giữ cho không khí không bị ô nhiễm.)
Đáp án B
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