4. Which of the following is NOT given as an advantage of using biological agents over chemical
herbicides?
A. They are less likely to destroy desirable plants.
B. They are safer for workers.
C. They are more easily available.
D. They do not have to be used as often.
Bạn đang xem 4. - Trắc nghiệm đọc hiểu tiếng Anh lớp 12
