The vowel is produced without (or with little) restriction during its production and is always voiced.（）
The vowel is produced without (or with little) restriction during its production and is always voiced.（）
相关考题：
An exercise with heterogeneity gives no opportunity for the really advanced students to exercise their capacity.（）
Of the two types of sentence stress, sense stress shows contrast, while logical stress shows meaning.（）
phoneme