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Chemical pollution will bring about a threat to agriculture and food chain, and
to human health.
A.frequentlyB.significantly
C.steadilyD.consequently
D

试题分析:考查副词。A. frequently频繁地;B. significantly意味深长地;C. steadily稳定地;D. consequently因此。句意:化学污染将给农业和食物链带来威胁,因此也会对人类健康带来威胁。故D正确。
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