Monophthongs are made with no (____) or change of the speech organs, while a diphthong is a vowel sound in the pronunciation of which its quality
(____), beginning as one vowel and ending as another.
出自:乐山师范学院英语语音

完成拼图验证

按住下方滑块,将拼图拖到缺口处后松开。

拼图背景,将小拼图拖到缺口处
向右拖动滑块