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Question 13. Protecting these plants is crucial because they are _________to maintaining the ecological balance. A. negligible B. integral C...
Thuộc tài liệu:7. TỪ VỰNG NÂNG CAO CHỦ ĐỀ: WILDLIFE CONSERVATION
Đề bài
Question 13. Protecting these plants is crucial because they are _________to maintaining the ecological balance.
A. negligible
B. integral
C. susceptible
D. conducive