循环小数5.013071307......的循环节是[ ]

A．013     

B．1307     

C．307

根据对话内容，从方框内选出能填入空白处的最佳选项，其中有两项为多余项。

A: Hi, David.   小题1:   

B: It’s 5:00.

A: The class will be over soon.     小题2:   

B: I’ll go to the English Club. And you?

A:     小题3:   

B: Is swimming your favorite sport?

A: Yes, I like it best.

B:     小题4:   

A: Because it keeps my heart and lungs healthy.

B: I think so.    小题5:   

A: Certainly. I’ll call you if I go.