A:the better our grades will be
B: our grades will be better
C:will our grades be better
D:even better our grades will be
读课文课《南极,一片净土》,文中说明“我们”为自己能自觉保护南极而感到自豪的句子是?
分组
频数
频率
10,15)
20
0.25
15,20)
50
n
20,25)
m
p
25,30)
4
0.05
合计
M
N