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7 Assumex=((1,2),(3,4,5),(5,6,5,9)),whatarelen(x)arelen(x[0])?()

题型：单选题

选项

A. 2 and 1

B. 2 and 2

C. 3 and 2

D. 2 and 3

E. 3 and 3

正确答案：C