题目内容

Which group of the following vowels are front vowels?

A. /ʌ/ /з://ə/
B. /i://ɪ//e//æ/
C. /ɑ:/ /ɔ://ɒ//u://u/

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English vowels can be classified based on 3 standards, which are ________.

A. the height of the raised part of the tongue
B. the part of the tongue raised
C. the position of the lips

The first sound of the diphthongs is generally ________, while the second one is weak, short and vague.

Vowels are sounds in which there is obstruction to the flow of air as it passes from the larynxto the lips.

A. 对
B. 错

When we pronounce pure vowels, we need to keep the the shape of the mouth unchanged.

A. 对
B. 错