下列关于生物圈的说法正确的是( )
甲校:
分组
70,80)
80,90)
90,100)
100,110)
频数
3
4
7
14
110,120)
120,130)
130,140)
140,150
17
x
2
乙校:
1
8
9
10
y
At school, some students are active ________ some are shy, yet they can be friends with one another.