A: What’s wrong with you, Tom? You look upset today. 小题1:      

B: No, Mum, but…

A:小题2:       

B: Well. What shall I do? I happened to break a window in Mr. Henry’s house.

A: Oh, did you apologize to Mr. Henry?

B:小题3:       

A: Come on, dear, please tell me the truth.

B: Paul and I were together.小题4:       

A: You shouldn’t have done that.

B: I know, but I daren’t phone Mr. Henry. And I’m also very sorry for Paul.

A:小题5:        Then you’d better hurry to see Paul. Give him back the money and if you like, invite him to tea tomorrow.

B: I will do as you say.

磁感应强度定义为与磁力线方向（）的单位面积上穿过的（）