Which of the following is NOT given as an advantage of using biological agents over

Câu hỏi :

Read the following passage and mark the letter A, B, C or D on your answer sheet to indicate the correct answer to each of the questions.

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

* Hướng dẫn giải

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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