含碘量较为丰富的食品有（）.A.菠菜 B.白 C.海带 D.胡萝卜

阅读理解。

     We have a flat (公寓) in London. There are six families in that building, Lucy and her son Tom, Tom is

a student in 14 middle school. He is thirteen years old. His mother is a policewoman, Flat 102 is Sally's family.

Her parents, Nick and Helen are teachers. Her grandpa, Peter lives with them. Sam and Mary are in flat 201.

They are very old. They have a son, Ned. Ned works in China now. Rose lives in Flat 202. She is a doctor.

Flat 302 is Joy's home. She is 71 years old. Joy has a daughter, Jane. Jane works in Hong Kong. Jean, Jane's

daughter, lives with her grandma. Every-one here is nice. They are all happy.

1. Where is our flat?

A. It's in China.

B. It's in England.

C. It's in Canada.

D. It's in America.

2. Where does Lucy work?

A. She works in a library.

B. She works in a school.

C. She works in a police office.

D. She works in a restaurant.

3. How may sons do Sam and Mary have?

A. They have one.

B. They have two sons.

C. They have four sons.

D. They have four sons.

4. Who is Jane?

A. She is Joy's mother, Jean's daughter.

B. She is Joy and Jean's mother.

C. She is Joy's daughter, Jean's mother.

D. She is Jean's grandmother, Joy's mother.

5. What's our flat's number?

A. It's 201.

B. It's 302.

C. It's 301.

D. It's 102.

下列职务必须由实行区域自治的民族公民担任的是：

A．自治区人大常委会主任

B．自治州党委书记

C．自治县县长

D．自治区高级人民法院院长

五一长假期间，小华和妈妈一起到南岸弹子石的洋人街去游玩，他用照相机给妈妈拍照，关于所成像的性质，下列说法正确的是（　　）

A．正立、放大的虚像

B．正立、缩小的虚像

C．倒立、缩小的实像

D．倒立、放大的实像

可溶性抗原定量测定用（）

A.免疫印迹法

B.ELISA

C.直接凝集试验

D.ELISA（间接法）

E.免疫荧光技术

气瓶操作中，氧气与乙炔瓶的距离为多远？