______young in our village are now living_______much more comfortable life than we did.
A:A;/
B:The;the
C:A;a
D:The;a
(Ⅰ)求全班人数及分数在80,100之间的频率;
(Ⅱ)现从分数在80,100之间的试卷中任取 3 份分析学生情况,设抽取的试卷分数在90,100的份数为X,求X的分布列和数学望期.
—________.They are pens.