Câu hỏi trắc nghiệm (5 câu):
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- A. environment
- B. ecology
- C. concentration
- D. community
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- A. alternative
- B. competitive
- C. conservative
- D. inexpensive
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- A. eliminate
- B. intervention
- C. eventually
- D. inhabitant
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- A. ecology
- B. minority
- C. historical
- D. favourable
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- A. equality
- B. eco-friendly
- C. inorganic
- D. vegetation