题目内容

Choose all the unstressed syllables you can hear?[音频]

A. son
B. and
C. some
D. then

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There are three stressed syllables in the sentence.[音频]

A. 对
B. 错

The first word in the sentence is a stressed syllable.[音频]

A. 对
B. 错

The unstressed words in the sentences are: (1), (2), (3), (4), (5).[音频]

氧化还原滴定曲线的纵坐标是______

A. ψ
B. PM
C. PH
D. C氧化剂