. One day I a newspaper article about one in six European mammal species threatened with e

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A. came at
(答案→)B. came across
C. came about
D. came after
解析：短语辨析。came at 攻击，达到； came across偶遇，无意中发现； came about   发生，改变方向；came after紧跟，继……而来。句意：一天我无意中发现一篇关于介绍欧洲六分之一的哺乳动物受到灭绝的威胁的报纸上的文章。故选B。