A phoneme is the smallest distinctive sound unit, incapable of change in different phonetic environments.（）

判断题Consonants vary depending on where and how the air stream gets through, the place and movement of the tongue, and also whether the voice is used or not.（）

判断题Vowels are formed mainly by the position of the tongue and, secondarily, by the shape of the lips and movement of the jaw.（）

判断题The vowel is produced without (or with little) restriction during its production and is always voiced.（）

判断题The Silent Way, Community Language Learning, and Suggestopaedia all lay emphasis on the individual and on personal learning strategies.（）

判断题A suggestopadia course is conducted in a classroom in which students are as comfortable as possible.（）