选择题：When pitch, stress and length variations are tied to the sentence rather than to

题目内容：

When pitch, stress and length variations are tied to the sentence rather than to the word，they are collectively known as ___________.

A.intonation

B.tone

C.phoneme

D.sentence stress

参考答案：

答案解析：

The study of language development over a period of time is generally called_____

The study of language development over a period of time is generally called__________linguistics.

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