Umbrella is used _____ keeping yourself from rain.[ ]
A. from
B. to
C. for
D. as
答案:C
在桶排序中,其平均时间复杂度是( )
A.O(1)
B.O(
C.O(n2)
D.O(1g
“傩堂戏”是哪个少数民族的民俗活动?()
A.土家族
B.苗族
C.傣族