根据对话内容，从方框内的选项中选出能填入空白处的最佳选项。选项中有两项为多余选项。

Tang Jun is chatting with his e-pal David (和网友大卫聊天) on QQ.

(D: David; T: Tang Jun)

D: Hi, how is it going these days?

T: Pretty good! We celebrated our Dragon Boat Festival (端午节) last week.

D: Dragon Boat Festival?         小题1:       

T: To remember an ancient Chinese poet (诗人).

D: How do you usually celebrate it?

T:       小题2:     . But this year, we did something more interesting. 

D: What did you do?

T: Our school had a Dragon Boat race.

D:     小题3:    . Who won the race?

T: Our class.

D:     小题4:     

T: Thanks a lot. I hope you can come to China sometime.

D:      小题5:   . I’m interested in Chinese traditions. Tell me more about them next time.

T: OK, I will. See you.

D: See you!

女，44岁。突发右下腹疼痛伴呕吐、停止排气排便6小时。查体：P110次/分，BP120/80mmHg，右侧腹股沟韧带下方卵圆窝处可及半球形包块，压痛明显，不能还纳。下一步处理正确的是（）

A.立即手术

B.密切观察病情变化

C.应用吗啡，缓解疼痛

D.立即扩容补液

E.手法还纳包块