According to the passage why are the chemicalsused in agriculture safe?A.They have never

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According to the passage, why are the chemicalsused in agriculture safe?

A.They have never been proven harmful before.

B.They produce larger crops.

C.They have a long history.

D.They are subject to high standards.

请帮忙给出正确答案和分析,谢谢!

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