问题 实验题

春节前期我国部分城市发生的禽流感,是由H7N9型病毒引起的一种急性传染病。我国政府采取了很多措施防止禽流感蔓延。请回答下列问题:

⑴引起禽流感的病原体是_     ,它的结构很简单,由___    外壳和内部的遗传物质组成。

⑵政府采取禁止鸡鸭流通上市、深埋病鸡病鸭的措施,是预防传染病流行三种措施中的            

⑶目前,很多科研工作者正在研制禽流感疫苗,以使人们获得对禽流感的免疫力,这种属于预防传染病的哪种措施__       _。

答案

(1)H7N9型病毒 蛋白质(2)控制传染源(3)保护易感人群

题目分析:(1)禽流感是由H5N1型病毒引起的一种急性传染病,因此禽流感的病原体是H5N1型病毒;病毒是一种特殊的生物,它没有细胞结构,只有由蛋白质组成的外壳和内部的遗传物质组成,营活细胞内寄生生活.

(2)预防传染病的一般措施有控制传染源、切断传播途径、保护易感人群;捕杀、深埋病鸡、病鸭的措施属于控制传染源.

(3)疫苗是将病原微生物及其代谢产物,经过人工减毒、灭活或利用基因工程等方法制成的用于预防传染病的制剂;疫苗保留了病原菌的抗原性,人体或动物注射疫苗后,免疫系统便会产生相应的抗体,使人体获得相应的免疫力;这种免疫力的获得是后天形成的,只对特定的病原体有作用,属于特异性免疫.

阅读理解

阅读理解。

    Tom is five years old. He has no brothers or sisters. He is a lovely boy. He doesn't go to school because

he is too young. He likes to play with other children in the small park every day.

     The park is near his building. In the park there are interesting things to see and play with.

     Tom's parents love him very much. They often buy him nice things. This time, his mother buys some

new clothes for him. The clothes are expensive and nice. Tom is very happy to wear them. 

     "Mum, can I go out and play with my friends? I want them to see my new clothes," asks Tom. "All

right, but please keep your clothes clean," says Mum. "I am going to do some cooking. We will have supper

after your father comes back." At about six, his father comes back from work. And Tom goes home for

supper.

     "Why do you have much earth (泥土) on your clothes?" asks his mother.

     "Because I have some falls (摔跤)," answers Tom. "You should not make the nice clothes dirty", Mother

says.

     "I'm sorry, Mum", says Tom, "But I have no time to take off my clothes when I fall."

1. Tom ______. [ ]

A. is six years old

B. is a student

C. is five years old

D. has a brother and a sister

2. How do you know Tom's parents love him very much? [ ]

A. They let him play with other small children.

B. They let watch TV all day.

C. They often buys some nice things for him.

D. Tom doesn't go to school.

3. How does Tom make his clothes dirty? [ ]

A. Hi friends make his clothes dirty.

B. He has some falls.

B. He doesn't like the new clothes.

D. He takes off his new clothes and puts them on the dirty earth.

4. The word "lovely" means ______. [ ]

A. 淘气的

B. 可爱的

C. 好看的

D. 喜爱的

5. Which is not right? [ ]

A. Tom doesn't go to school.

B. There is a small park near his home.

C. Before Tom falls, he takes off his clothes.

D. Tom often goes out to play with his friends.

单项选择题 A1/A2型题