根据对话内容，认刊话后的选项中选出能填人空白处的最佳选项，并在答题卡上将该项涂黑。

选项中有两项多余选项。

一Remember Jack from our old school?

一小题1:　

一I met him at the checkout in the supermarket the other day, and he was queuing right in front of me

一小题2:　

一Well, he started out as a manager in charge of sales. 小题3:　 He teaches commercial English there

一Why did he get this new job? 小题4:　

一Yes. It is tiring, though. After all, he has got a family to take care of.

一I see. 小题5:　

一Exactly

A．Why not?

B．Of course I do.

C．Sometimes it is a painful choice, career or family.

D．Isn't he working in a company as a sales manager?E. But he ended up getting a job at the local university.

F. Then he transferred to work for an international giant

G. Isn't it interesting to travel around as a sales manager?

莫里斯蠕虫是指什么？它有什么特点？