元组变量t=("cat","dog","tiger","human"),t[::-1]的结果是:（）
A.('human',"tiger','dog'，'cat')
B.[human','tiger','dog'，'cat']
C.{'human','tiger','dog','cat'}
D.运行出错
正确答案：C
元组变量t=("cat","dog","tiger","human"),t[::-1]的结果是:（）
A.('human',"tiger','dog'，'cat')
B.[human','tiger','dog'，'cat']
C.{'human','tiger','dog','cat'}
D.运行出错
正确答案：C