已知一个样本如下：83，85，87，89，84，84，85，86，88，87，对这些数据进行分组，其中86.5～88.5这组的频数是[ ]

A．2        

B．3        

C．4          

D．0.3

用所给词的正确形式填空。

1. It takes ___________ (little) time to go there by underground than by bus.

2. Many ___________ (butterfly) have round marks on their wings that look like eyes.

3. Last night it rained ___________ (heavy) in the southern part of the city.

4. There's not much ___________ (different) in price between the two mobile phones.

5. Thank you for your ___________ (value) help and practical advice.