C-3：chalk talk 边板书边讲话
A:What is Mary doing with her friends?
A:玛丽和她的小伙伴们在干吗？
B:She's giving them a chalk talk of a mathematies problem.
B：她正连写带画地给他们讲一道数学题呢。
A:She's really like a little teacher.
A:她真像一个小老师。
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