A. They are safer for workers.
B. They are less likely to destroy desirable plants.
C. They are more easily available.
D. They do not have to be used as often.
Đáp án : C
Thông tin ở đoạn cuối cùng:
- The biological agents now in use are environmentally benign and are harmless to humans. (They are safer for workers)
- leave crops and other plants untouched.( They are less likely to destroy desirable plants.)
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