Three weeks after the application of the spica cast following surgery for an infant, the mother told the nurse that the infant's toes are swollen and cool to the touch. Which of the following would the nurses suspect

A．Cotton wadding lining of the cast has shrunk.

B．An infection has developed under the cast.

C．Child's feet were in a dependent position.

D．Child has outgrown the spica cast.

阅读课文《如果人类也有尾巴》第3、4两段（即从“以上仅仅是外表”至“体操也会因尾巴可以保持平衡而使动作更难、更精彩……”），完成问题。

1．“以上仅仅是外表，而尾巴的存在则使人们更容易表达一些内在的东西。”这句话在文章结构上有什么作用呢？

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2．请用一句话概括这两段的内容。

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3．尾巴的神经末梢发达有什么作用呢？

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4．请你展开大胆的想象，为第4段的省略号处补写一句话。

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