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Câu hỏi:
What is a serious problem of Lake Baikal in Russia?
- A. It contains a rich variety of animals and plants.
- B. It is polluted by massive volumes of industrial wastes discharged into it.
- C. It has 1,300 rare species that do not exist anywhere else in the world.
- D. The government did not have the power to enforce laws and regulations.
Lời giải tham khảo:
Đáp án đúng: B
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