M2 Unit 2 What's your number?
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M2 Unit 1 Open your book.
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Unit 3 This is my friend.
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Unit 2 Good morning. I'm Chen Zhong.
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Unit 1 Good morning,Miss Zhou.
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清浊辅音等发音
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双元音
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长元音短元音区分
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双元音&Keyword
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长元音&Keyword
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