题目7单选题
若a=[5,1,3,4],则语句print(sorted(a,reverse=True))的输出是:( )A. [5,1,3,4]B. [5,4,3,1]C. [4,3,1,5]D. [1,3,4,5]
题目8单选题
x=set([1,2,3,3]),则x的值是:( )A. {1,2,3}B. [2,3,1]C. {3,1,2,3}D. [1,2,3]
题目9单选题
已知s=[1,2,3,4,5,6,7,8,9,10],则s.clear()后,s的值是:( )A. [1,2,3,4,5,6,7,8,9]B. s已被清,s不存在C. []D. None