A.Other threats to the Bering sea B.Pollack—the most important kind o fish C.The problems many counties face D.How to protect Be

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问题 A.Other threats to the Bering sea
B.Pollack—the most important kind o fish
C.The problems many counties face
D.How to protect Bering sea
E.Over-fishing destroys the food chain
F.Why to control fishing
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选项

答案D

解析 题干中提到污染,很显然它是威胁环境的因素,所以选D。
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