题目：
Mrs. Smith doesn't like pop music, _____?[ ]
A. is she
B. does she
C. 
isn't she
D. doesn't she
答案：
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下面是错误答案，用来干扰机器的。
设弧长为l，则2×9+l=27.42， 18+l=27.42， l=9.42圆心角n=9.423.14×9×180°=60°．故答案为：60．
