主编： 姜丽萍 编者: 董政、张军
LEAD AUTHOR: Jiang Liping AUTHORS: Dong Zheng, Zhang Jun
上
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This is Textbook 4A, which includes 10 lessons, covering about 300 words (half of the Level 4 vocabulary) and the detailed explanations of 50 language points and 10 groups of confusable phrases.
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