问题 问答题 简答题

猪的病毒性腹泻有哪几种?各有什么特点?怎样防治?

答案

参考答案:

猪的病毒性腹泻主要有三种:

猪传染性胃肠炎

猪流行性腹泻

猪轮状病毒感染

共同特点为:严重水泻,间有呕吐,10日龄内仔猪感染,死亡率均在50%以上,甚者达100%。育肥猪或成年猪感染后死亡率极低。仅从临床症状上很难区分是那种病毒感染。

猪传染性胃肠炎和猪流行性腹泻发病有明显的季节性,并呈地方流行性,一般多在冬春寒冷季节多发。猪轮状病毒感染,没有明显的季节性。

妊娠母猪产前3周注射疫苗是预防初生仔猪感染的最好方法。育成猪和成年猪感染因死亡率极低,采取饮水里加入氨基多维和补液盐的方法以避免脱水,加入广谱抗菌药以预防继发感染。

阅读理解

阅读理解。

     26-meter-tall Yao Ming made his NBA debut (初次登台) on October 23, 2002 and got 6 points

for the Houston Rockets in the game. The next day, he got 13 points (得分)in another game.

     Most people think that Yao Ming is a born basketball player. But Yao said, "When you watch it on

TV, it looks very easy. But when you are playing in the NBA, it is really not so easy." He said that joining

the Houston Rockets was a new start and a new challenge. "I hope that through very hard work I can

make everyone happy and help the Rockets win more games," he said.

     Yao Ming speaks some English. Both he and his teammates can undersand each other. They don't

think there is a language problem. While Yao Ming faces this new challenge, the people of Houston have

shown great interest in him and they hope Yan Ming faces this new challenge, the people of Houston

have shown great interest in him and they hope Yan Ming will bring new energy (活力) to the Rockets.

The team has started having lessons to learn more about China, and many people who work for the

Rockets have learned to speak some Chinese.

1. Yao Ming got 13 points on October _____, 2002.

A .22  

B. 23  

C. 24  

D. 26

2. Yao Ming said that _____.

A. playing in the NBA was difficult

B. it was hard to watch NBA games on TV

C. he was an NBA star      

D. it was boring to play basketball

3. The people of Houston hope Yao Ming will _____.

A. speak excellent English    

B. bring new energy

C. make NBA games easy    

D. face new challenge

4. From the passage we can know that Yao Ming _____.

A. will work hard for his team

B. made the highest score in his first NBA game

C. can't understand his teammates

D. teaches the Rockets workers Chinese himself

5. The passage is probably _____.

A. an advertisement      

B. a notice

C. a news report        

D . an instruction

单项选择题