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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

解析試題分析：考查副詞。A. frequently頻繁地；B. significantly意味深長地；C. steadily穩(wěn)定地；D. consequently因此。句意：化學(xué)污染將給農(nóng)業(yè)和食物鏈帶來威脅，因此也會(huì)對人類健康帶來威脅。故D正確。
考點(diǎn)：考查副詞

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