题目内容

/eɪ/ is a closing diphthong and /ɪə/ is a centring diphthong.

A. 对
B. 错

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更多问题

Our mouth shape makes changes when we pronounce diphthongs.

A. 对
B. 错

The first vowel of a diphthong is as long as the second vowel.

A. 对
B. 错

All diphthongs are voiced.

A. 对
B. 错

地震的破环作用主要表现为三种形式

A.地表破坏
B.人员伤亡
C.次生灾害
D.建筑物的破坏