人们能够发音是因为呼气时，从肺部呼出的气流震动了（） A

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问题选择题

人们能够发音是因为呼气时，从肺部呼出的气流震动了（　　）

A．鼻

B．咽

C．支气管

D．声带

答案

当膈肌和肋间外肌舒张时，肋骨与胸骨因本身重力及弹性而回位，膈顶部上升，结果胸廓缩小，肺也随之回缩，形成被动的呼气运动．可见，呼气时膈肌舒张、肋骨间的肌肉舒张，肺缩小、胸廓缩小．从肺部呼出的气流震动了声带．

故选D

填空题

请从方框中选择合适的单词，并用其适当形式填入短文中，使其意思完整（每空一词，

此题有两个多余选项）。

have,sometimes,down,hospital ,Never,live,sleep

Bob and his wife, Cindy, 1.___ _ in a house near a hospital. Bob doesn't like living near a hospita1.

Ambulances(救护车)go up and 2. the street. They have loud sirens (警报器). 3._____ the

noise is terrible. The sirens scare Bob, especially at night when he is trying to 4._____.

"I want to move."Bob tells Cindy.

"No," says Cindy."We are not moving. I like this house."

"I am going to have a heart attack(心脏病)."says Bob.

"Don't worry. There is a 5._____ around the corner."says Cindy.

解答题