题目内容

To pronounce the four back vowels /u:/, /ʊ/, /ɔ:/ and /ɒ/, our lips should be rounded.

A. 对
B. 错

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更多问题

We can use a shortened version of /ɔ:/ to pronounce /ɒ/.

A. 对
B. 错

The /u:/ marks the highest boundary for the back vowels, as /i:/ does for the front vowels.

A. 对
B. 错

Question 1[音频]

Question 2[音频]