题目内容

The air sacs through which gases are exchanged in the lungs are the ________.

A. trachea
B. alveoli
C. bursae
D. bronchi

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The structure that holds the vocal cords is the ________.

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The tubes that carry air from the trachea into the lungs are the ________.

A. arteries
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The dome-shaped muscle under the lungs is the ________.

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