墨尔本PTE 阅读排序 2950

A. All sounds are the result of minute fluctuations in air pressure; speech sounds in particular represent patterned fluctuations that are created when we force air through the vocal tract.   

B. The specific pitch of a person’s voice reflects the fundamental frequency at which the vocal folds are vibrating and thereby imposing periodic variations in air pressure, measured in hertz, or cycles per second.   

C. Voice pitch, the perceived “highness” or “lowness” of a voice, fundamentally is an expression of physiology, not psychology.   

D. The flow of air is modified by the vibration of the vocal folds (or vocal cords) in our larynx (or voice box), as well as by the movement and relative positions of our tongue, jaw, lips, and so forth.