题目

As is known to all, _______ opening ceremony of the 16th Asian Games held on November 12th inGuangzhou was _______ great success. A . /; a B . the; a C . the; / D . a; / 答案：B呼吸道是气体进出肺的必经之路．吸入的气体在此路途中，被有关结构进行了一定的处理．请将下列结构与其功能用线连接起来．1呼吸道内作支架的骨或软骨           A温暖吸入的冷空气2鼻腔黏膜中分布的丰富的毛细血管     B清洁吸入的空气3呼吸道黏膜分泌的黏液               C湿润干燥的空气4鼻腔前部生有的鼻毛                 D保证气体顺畅通过．