问题 问答题 简答题

刚地弓形虫感染广泛流行的原因是什麽?人感染弓形虫的方式和途径有哪些?

答案

参考答案:

(1)广泛流行的原因:

1、刚地弓形虫对宿主选择性不强,中间宿主广泛,人和动物都能感染,是人兽共患寄生虫病。

2、生活史中含多个感染阶段(卵囊、包囊、假包囊)

3、刚地弓形虫可在终宿主间、中间宿主间以及中间宿主和终宿主之间传播。

4、包囊、卵囊对外界抵抗力强,在中间宿主的组织内存活时间长。

5、卵囊排放量大,对外界环境污染重。

6、感染方式简单,主要经口感染。

(2)感染途径和感染方式:

1、先天性感染:速殖子经胎盘感染

2、误食被卵囊污染的水源和食物

3、经口食入未煮熟的被包囊和假包囊污染的肉类

4、含滋养体的血液经输血感染或含包囊的组织经器官移植感染

5、接触含滋养体的感染动物血液或脏器,经破损的皮肤、粘膜感染

6、节肢动物携带卵囊传播,经口感染

阅读理解

阅读理解。

     You can improve your child's hearing memory considerably(在很大程度上). Once his

hearing memory has been greatly improved, he'll be able to use and remember what he listens

to in class. The success of these suggestions depends upon your ability to use your child's

natural desire to get involved in games he finds simple and fun.

     A good way to begin is to read aloud a sentence from a book suitable for your child's

reading age. Then ask your youngster to repeat the sentence back to you correctly. Next,

reread the sentence, leaving out a particular word. See if your child can identify the word

you left out. At the beginning use only simple sentences. Gradually, increase the length of the

sentences. Make sure you don't rush things along too quickly, or your child may become

discouraged and tired of the game.

     Take your child shopping with you often. He's to remember a list of items you want to buy

in the supermarket. First , ask him to remember only a few things. Then, as he shows increased

ability to remember, make the list longer and longer. Praise him often and warmly when he

shows increased ability to remember things. He'll become proud of his 'good' memory and

will happily play the game.

     Encourage your child to learn easy and short poems. As his ability to do this becomes

stronger, encourage him to remember longer poems. Do the same with songs.

1. The suggestions will be successful if____.

A. you find simple and funny games for your child

B. you can stimulate(激发)your child's interest in the activity

C. you force your child to get involved in more practice

D. you improve your own hearing memory first

2. The purpose of asking your child to repeat what you say is ____.

A. to practice his pronunciation

B. to develop his reading skills

C. to help him remember what he hears

D. to play a simple game he may find fun

3. The third paragraph mainly talks about _____.

A. another way to improve your child's hearing memory

B. how you should take you child shopping with you

C. how to remember the items you want to buy

D. the way you help your child do shopping

4. The last sentence 'Do the same with songs' means you should encourage your child to learn

and remember _____.

A. songs in the same way as he does with poems.

B. poems in the same way as he does with songs

C. the poems and songs which are similar in meaning

D. those songs that have the same meaning as poems

5. Who are the supposed readers of this passage?_____

A. Children.

B. Parents.

C. Teachers.

D. Psychologists

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