Fill in the blank. (选择适当的句子填入空白处)   

A: Hello. 1____

B: This is Sarah speaking. 2_      

A: What's the matter?

B: 3_      

A: I'm sorry to hear that. 4      _

B: Thank you. Are you having a good time?

A: Yes. 5      _

B: I want to come, too.

A. I hope you'll get better soon.

B. We are singing and dancing.

C. Sorry, I can't go to the party.

D. Who's that?

E. I have a cold.

病历摘要：斜疝并肠梗阻患者，男性，2岁。呕吐.发热10天，腹胀.腹痛1周。查体.腹部膨隆，压痛.反跳痛阳性，未扪及包块。行腹部卧位及左侧卧位片检查。

3、鉴别诊断有哪些？