题目内容
What part of the pharynx serves as the common passageway for air and food?
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The _____, a flap of cartilage acting like a lid over the larynx, lies over the entrance to the larynx.
The trachea is kept open by 16-20 C-shaped rings of cartilage separated by _____
At the end of the bronchioles are clusters of air sacs called______
Each lung is enveloped in a double-folded membrane called _____
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