Which of the following best summarizes the text?
A．Lots of animals learn, but smarter isn't better.
B．Humans pay hidden costs for learning.
C．Learning has dangerous side effects to animals.
D．Animals learn to adapt to changing environment.

A.Lots
B.
B．Humans
C.
C．Learning
D.
D．Animals
E.


【参考答案】

A
属主旨思想题。文章前一部分讲到学习这种行为在动物界非常普及，专家认为具有神经系统的生物都有学习能力，而后一部......

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