Chemical pollution will bring about a threat to agriculture and food chain, and ________ to human health.


  1. A.
    frequently
  2. B.
    significantly
  3. C.
    steadily
  4. D.
    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;結合句意可知D正確。句意:化學污染給農(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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