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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正确答案:C
细节题。作者在文中多次强调使用化学肥料并不会毒害土地,他说自从欧洲移民在美国定居就已经开始在这片土地上使用化学肥料了,并取得了非常好的效果,故可以证明其是无害的,所以C选项是正确的。
