a. hello.
b, hello,nice to meet you.
a, nice to meet you,too.what is your name?
b, my name is ##,and you?
a, i am ##.
A:how old are?
B:i am 4 years old.
a:me,too.How about making friends with me?
b:good idea.
(这是老师走了过来)
A,B::good morning ,teacher!
这个很好
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