填空题 A distinction is made between vowels where the quality remains constant throughout the articulation and those where there is an audible change of quality. The former are known as PUPE or MONOPHTHONG VOWELS and the latter, VOWEL GLIDES.

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【正确答案】 1、T    
【答案解析】[解析] 本题考查纯元音(pure vowels)和元音音度(vowel glides)的概念。发音过程是音质保持不变的元音就是纯元音或单元音，发音过程中音质有听觉上的变化的元音就是元音音度。