（1）单选题
A a neutral middle vowel; occurs in unstressed syllables
B. a neutral middle vowel; occurs in stressed syllables
B a neutral middle vowel; occurs in stressed syllables
（2）单选题
The word was is made of the sounds /w/, /ɔ:/, / z/, but in spoken English, the word was is unstressed, then the vowel sound/ɔ:/ changes to________.
A /a:/
B /ə/
（3）单选题
Which sound is schwa?
A /a:/
B /ə/
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