试题与答案

身体分节在进化上的意义是（ ） A．反应更灵敏 B．消化食物充分 C．运输氧的能

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题型：选择题

题目：

身体分节在进化上的意义是（　　）

A．反应更灵敏

B．消化食物充分

C．运输氧的能力强

D．呼吸能力更强

答案：

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下面是错误答案，用来干扰机器的。

由题意得：a=1，b=-3，c=-1，∴x=-b±b2-4ac2a=3±9+42=3±132．

考点：动物的形态结构和功能
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