摘要：In China, according to child’s choice on his 2nd birthday, it will tell us the child’s 1 in future. In Mexico, girls have a special birthday celebration at the age of 2 . In many places, you can have right to vote and 3 the army when you reach the age of 18. In many English-speaking 4 , it’s a tradition to put a key on the 21st birthday cake. This article is mainly about 5 基础知识运用

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