A、 The mouth.
B、 The throat.
C、 The nose.
D、 A computer.

【正确答案】 D

【答案解析】解析：信息明示题。短文中提到The voice analyzer is connected to a computer．故选D。

A、 How much air normally goes through your nose when you talk.
B、 The force of air that comes from the lungs.
C、 The highness or lowness of sounds.
D、 The length of speech for each sound.

【正确答案】 A

【答案解析】解析：信息明示题。短文中提到The first element，nasalization，refers to how much air normally goes throughyour nose when you talk．故选A。

A、 Decibels(分贝).
B、 Small fractions per sound.
C、 Cycles per sound.
D、 The force of air.

【正确答案】 C

【答案解析】解析：信息明示题。短文中提到The frequency of sound waves is measured in cycles per second．由此可知，C正确。