Chemical pollution will bring about a threat to agriculture and food chain, and ________ to human health.
A．frequentlyB．significantlyC．steadilyD．consequently
D
副詞辨析。A頻繁地；N重要地；C穩(wěn)定地；D所以，因而，因此；結(jié)合句意可知D正確。句意：化學(xué)污染給農(nóng)業(yè)和食物鏈產(chǎn)生很大的威脅，因而對人類的健康也會有很大的威脅。
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