The back-chaining technique means the students repeat a sentence after the teacher, starting from the end part of the sentence and moving towards the beginning.（）

A phoneme is the smallest distinctive sound unit, incap...

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

Consonants vary depending on where and how the air stre...

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.（）

Vowels are formed mainly by the position of the tongue ...

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.（）