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Questions 17～20 are based on the following talk. You now have 20 seconds to read Questions 17～20.
What is the difference of the language of a child of four from that of his parents

A．The vowel sounds.
B．The grammar.
C．The style.
D．The vocabulary.

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单项选择题

单项选择题

Questions 17～20 are based on the following talk. You now have 20 seconds to read Questions 17～20. What is the difference of the language of a child of four from that of his parents 您的浏览器不支持 audio 元素。