引起胞生痰核的病因是：（）A．素有近视 B．素有远视 C．营养不良 D．睡眠不足 E

某乡有人口2万人约5000户，欲以户为单位抽其中2000人进行某病的调查

若按该乡家庭人口登记名册，随机抽取第1户，随后每间隔几户，再抽取，对被抽到的家庭进行调查。这种抽样方法称为（）

A.多级抽样

B.整群抽样

C.分层抽样

D.系统抽样

E.简单抽样

A: Who is your favourite singer?                  

B: Li Yuchun.                                              

A:  小题1:_                                                                                        

B: She was born in 1984 in Chengdu, Sichuan.               

A: So she is twenty-seven years old now.                

B:   小题2:

A: Do you know where she studied?

g: Yes. She studied at Sichuan Music College.   小题3:

A: Do you know what her hobbies are?

B: Sure. 小题4:

A: I know many young people like her.小题5:

B: Well, I think that’s because she sings well.

6个月女婴，呕吐、水样便2天，大便每天10次，高热1天，汗多、进食少、尿少、口渴。查体：烦躁不安，肢温，皮肤弹性差，心肺（-），膝反射亢进。补充累积损失量应首选（）

A.3：2：1液50～60ml／kg

B.4：3：2液50～60ml／kg

C.1／2张液60～80ml／kg

D.1／3张液60～80ml／kg

E.10％葡萄糖液60～80ml／kg

The police confirmed that the victim was killed at the place _______she _______.

A．which; found

B．where; was found

C．that; been found

D．which; was found

简述乙肝病毒分子生物学标志物的临床意义。