/ɑ:/is a long, open, rounded tense back vowel.
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请选出划线部分发音不同的选项:
A. bird
B. nurse
C. worker
D. worm
以下哪个单词的划线部分发/ə:/?
A. ago
B. teacher
C. labour
D. nervous
/ə/generally appears in stressed syllables.
A. 对
B. 错
以下单词中,哪个划线部分发/ʌ/?
A. hot
B. wonderful
C. from
D. together