(单选题)

What has greatly disturbed the Arctic marine mammals? ( )

A.Contaminants being discharged into the Arctic waters.

B.Increases in ultraviolet radiation due to ozone depletion.

C.Noise pollution from anthropocentric activities.

D.Overfishing by commercial fishermen.

参考答案：C

参考解析：

根据原文中最后一段......researchers suggest a limit on the amount of noise ships can make and requiring ships to move at slower speeds to reduce the chance of striking.可知……研究人员建议限制船只发出的噪音，并要求船只以较慢的速度移动，以减少撞击的机会。可以看出noise ships是最大的根源。故本题正确答案选C。

知识点：细节题英语阅读理解通用英语