问题 选择题

2008年奥运会就要召开了。福娃“妮妮”的原形是一只小燕子,燕子特有的呼吸方式是

A.双重呼吸

B.肺与气囊同时呼吸

C.用气囊呼吸

D.用肺呼吸

答案

答案:A

题目分析:燕子属于鸟类,鸟类在飞行时,需要消耗很多的能量,鸟类有气囊,与肺相通,主要功能是贮存空气,当家鸽飞行时,两翼上下扇动,这样就促使气囊扩张和收缩,当两翼举起时,气囊扩张,外界的空气就进入肺里,其中大量空气在肺内进行气体交换,也有一部分空气进入气囊,当两翼下垂时,气囊收缩,气囊里的空气又经过肺而最后排出体外,这样,每呼吸一次,空气就两次经过肺,在肺里进行两次气体交换,因此,这种特殊的呼吸方式,叫做双重呼吸,此题答案为A。

点评:此题为基础题,解答此题的关键是掌握双重呼吸是鸟类特有的呼吸方式,是与飞行生活相适应的。

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