李老师:
我是七年级(2)班的学生小珊,我现在有一道难题,请你帮我解决,好吗?
自从上初中以来,我觉得班主任老师对我们特别严格,甚至有些不讲道理,常常使我感到困惑。我很敬爱我们的班主任老师,但是很怕与他交流。有时好像有许多话想跟他讲,但当他来到我身边时,我却什么也讲不出来。我非常想与我们的班主任老师成为知心朋友,又觉得自己与老师之间存在一段距离,令我左右为难,我该怎么办呢?
根据上述材料,回答下列问题:
打字数/个
50
51
59
62
64
66
69
人数
1
2
8
11
5
将这些数据按组距5(个字)分组,绘制成如图的频数分布直方图(不完整).
It is Sunday today. Anna goes shopping with her mother. She wants her mother to buy a new coat for her. In Hongxing Shop, she finds a green coat. She tries it on. It's too small. She wants a big one, but the big one is not green. Anna doesn't like other colors.” Let's go to another(另外的) shop to have a look.”her mother says. Then they go to Jiajiale Shop. The shop is big and they see many kinds of coats in different colors and sizes(尺码). Anna tries on a green one. It looks nice on her. So they take it for forty-five yuan.
下列自然现象中,能够说明分子运动的是( )