已知全集U={1,2,3,4,5},集合A={1,2},B={2,3},则(∁UA)∪B=( )
A:{3}
B:{4,5}
C:{1,2,3}
D:{2,3,4,5}
美国“机遇号”火星车已找到火星可能有过适合生命栖居环境的依据,主要是在火星表面发现( )
阅读对话,判断正误,对的写“正确”错的写“错误”
Mingming: What are you doing, Lingling?
Lingling: I'm training. I'm going to do the high jump. What are you going to do for Sports Day?
Mingming: I'm going to run the 100 metres.
已知七位评委为某民族舞蹈参赛演员评定分数的茎叶图如图中左边为十位数,右边为个位数.去掉一个最高分和一个最低分,所剩数据的平均数和方差分别为 ( )