题目内容

Pitch is produced by frequency of vibration of the vocal cords. The higher the frequency, the higher the pitch.（）

A. 对
B. 错

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论述题为什么要归纳语音的音位系统？

新拌混凝土的工作性，就是拌和物的流动性。

A. 对
B. 错

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A. 对
B. 错

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. 对
B. 错