题目内容

设s='abcdefg',则s[3]的值是（）,s[3:5]的值是（）,s[:5]的值是（）,s[3:]的值是（）,s[::2]的值是（）,s[::-1]的值是（）,s[-2:-5]的值是（）。

A. 'de','d','abcde','defg','aceg','gfedcba',''
B. 'de','d','defg','abcde','aceg','gfedcba',''
C. 'de','d','defg','abcde','gfedcba','aceg',,''
D. 'd','de','abcde','defg','aceg','gfedcba',''

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