问题 问答题 简答题

什么是猪的伪狂犬病?如何防治?

答案

参考答案:

伪狂犬病是急性传染病。病猪年龄不同,其临床症状也有差异,但是,都无明显的局部瘙痒现象。⑴哺乳仔猪及离乳幼猪体温升高、呼吸困难、流涎、呕吐、下痢、食欲不振;精神沉郁;肌肉震颤、步态不稳、四肢运动不协调;眼球震颤,间歇性痉挛,后躯麻痹,有前进、后退或转圈等强迫运动;常伴有癫痫样发作及昏睡等现象。神经症状出现后1—2天内死亡,死亡率可达100%。若发病6天后才出现神经症状,则有恢复希望。但可能有永久性后遗症,如瞎眼、偏瘫、发育障碍等。⑵青年猪常见便秘,一般症状和神经症状较幼猪轻,病死率也低,病程约4—8天。⑶成年猪常呈隐性感染,较常见的症状为微热、倦怠、精神沉郁、便秘、食欲不振。数日即恢复正常,很少见到神经症状。⑷怀孕母猪于受胎40天后感染时,常有流产、死胎及延迟分娩等现象。怀孕后期感染的则产出木乃伊胎,也有活产胎儿,但胎儿常产后不久出现典型的神经症状而死亡。母猪流产前后,大多无明显的临床症状。

本病的防制主要是注射疫苗、病猪可注射高免血清、用康复猪的血清进行治疗。治疗的同时必须给维生素B1。

阅读理解

阅读理解

     In her sixth period today, Mrs. Cox has taught a poem by a well-known black writer in the United

States. She wrote the poem on the blackboard and read it aloud.  

     No sooner had she finished reading the poem than students' questions began pouring in. One boy said

the poem was heart-breakingly sad. Another student, a girl, said she had read a book by the same writer, but she wasn't able to enjoy it as much as her mother did, and she didn't know why. A third, a keen

viewer of TV theatre, recognized a phrase in the poem which had been used as the title of a recent play.

As she answered the questions, Mrs. Cox made sure that her students understood every line of the

poem.  he  asked  them  to  discuss  if  the  poem  contained  any  message.  The discussion became so

lively that no one wanted to stop when the bell rang. Some said there was no message, some said it didn't

really matter, and the class ended at that.  

     As she drove home, Mrs. Cox thought about the class she had just left. Today she could feel good

about what she had accomplished as a teacher. None of her students looked bored. Every one of them

seemed interested in the poem. Once they started to talk, they forget about the time. She did not have

to make them learn? she only had to answer their questions and to guide the discussion. This, she thought

to herself, is what teaching is all about! 

 

1. Mrs.Cox was a ________  

A. writer      

B. poet        

C. teacher      

D. poet and teacher  

2. One of the students said_____________  

A. the poem wasn't sad at all  

B. she wasn't able to enjoy the poem as much as her mother did  

C. he recognized a phrase in the poem which had been used as a title of a  recent play  

D. he understood every line of the poem  

3. Which of the following is Wrong?  

A. The writer of the poem had written a book.  

B. A student often went to a TV theatre.  

C. Every student was excited when discussing the poem.  

D. The discussion ended before the bell rang.  

单项选择题