题库 Science 题目列表 What is the purpose of the Eustachian tube [yoo-ST...
Single Choice
What is the purpose of the Eustachian tube [yoo-STAY-shuhn]?
A.

It improves outer ear transmission of sound

B.

It improves vibration of the malleus

C.

It assists in decreasing hearing

D.

It clears mucous from the middle ear into the throat

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