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Which of the following statements about the use of chemical ?

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Which of the following statements about the use of chemical agents as herbicides would the author most likely agree?

It is safe but inefficient.

It is occasionally required.

It should be increased.

It has become more dangerous recently.

Giải thích

Đáp án B
Dẫn chứng: The global need for weed control had been answered mainly by the chemical industry. Its herbicides are effective and sometimes necessary ….