A：水
B：砂子
C：煤油
D：二氧化碳
—What will you do tomorrow?
—I will____.
— Thank you for your email, Millie.
— .
棉花纤维长度x
频数
0≤x＜8
1
8≤x＜16
2
16≤x＜24
8
24≤x＜32
6
32≤x＜40
3
