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请同学们拍摄3-5分钟的居家锻炼视频（其中必须包括准备姿势和移动步法），可以压缩视频清晰度

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Theopening betweenthevocal cords is sometimes referred to as __________.

A. glottis
B. vocal cavity
C. pharynx
D. uvula

Thediphthongs thatare made witha movement ofthetongue towardsthecenter are known as __________ diphthongs.

A. wide
B. closing
C. narrow
D. centering

Whichbranch ofphonetics concerns theproduction ofspeech sounds?

Acoustic phonetics
B. Articulatory phonetics
C. Auditory phonetics
D. None oftheabove

Whichvowel is differentfrom theothers according to thecharacteristics ofvowels?

A. [i:]
B. [u]
C. [e]
D. [i]