(单选题)

What does the author think of the researchers' advice on marine animal protection? ( )

A.It is incredible.

B.It is unrealistic.

C.It is sensible.

D.It is flexible.

参考答案：C

参考解析：

根据原文中最后一自然段the Marine Mammal Commission's Randall Reeves says it is unrealistic to try and stop people from using Arctic passageways.可以看出unrealistic是Randall 说的话，因此可以排除B选项。根据However, by understanding which animals are at risk, researchers can help plan for the future的understanding可以看出作者的观点认为是在未来可以实施的。故本题正确答案选C。

知识点：态度题英语阅读理解通用英语