/aɪ/ is a rising diphthong. ( )
举一反三
- Which is NOT a rising diphthong?（ ） A: ei B: ai C: au D: a:
- According to the tongue movements, [ aʊ] is a( )diphthong. A: centering B: falling C: opening D: rising
- According to the tongue movements, [aʊ] is a（ ）diphthong. A: centering B: falling C: rising D: opening
- What is a diphthong?
- The first vowel of a diphthong is as long as the second vowel.