问题 单项选择题 A1型题

吉兰-巴雷综合征典型的脑脊液改变是()。

A.细胞数增高,蛋白质增高

B.细胞数降低,蛋白质降低

C.糖、氯化物降低

D.淋巴细胞明显增多

E.细胞数正常,蛋白质增高

答案

参考答案:E

解析:吉兰-巴雷综合征发病第2周后,大多数患者脑脊液内蛋白增高而细胞数正常或接近正常,脑脊液蛋白质升高的机制普遍认为:①神经根脱髓鞘后,蛋白质溢入脑脊液;②由于神经根的炎症,使脑脊液中蛋白质回吸收障碍,而水分吸收相对较好,使蛋白质浓缩;③机体的迟发性自身免疫反应中的球蛋白进入蛛网膜下腔。因免疫反应发生在周围神经的髓鞘,不在中枢神经内,故脑脊液细胞数不增加,称为蛋白-细胞分离现象,此现象为本病的特征。

默写题
阅读理解

阅读理解。

     As one of nature's top predators (捕食性动物), the tiger is not an animal, that we would ordinarily think

of as being a chicken.

     However, one tiger, which lives in an English zoo, turned out to be more cowardly than his keepers could

ever have imagined.

     Tanvir, a two-year-old Bengal tiger, got stuck at the top of a new 5m-high activity tower in his enclosure,

after climbing it for the first time.

     The branching tower had been designed to provide mental stimulation for Tanvir by testing his ingenuity,

but after scaling the exercise structure in just a few seconds, he lost his nerve when it came to coming back

down.

     Tanvir went on to spend nearly two days at the top of the tower trying to pluck up the courage to attempt

a descent.

     A spokesperson for the zoo said chat Tanvir had taken half an hour to come down from a smaller structure

only l.5m high previously, and that the taller tower had clearly been too much for him.

     "Every time he gets to the edge, he looks out, puts a paw over, and thinks, 'no, I'm not doing it!'" said

Samantha Cordrey.

     In the end Tanvir's hunger got the better of his fear, and after almost 48 hours he made his way down in

order to eat.

     It appears that Tanvir is none the worse for his experience, but it is not known if he will find the guts (勇

气) to go back up his exercise tower again.

     The whole episode only serves to underline the difficulties faced by zoo staff in creating environments that

will stimulate the animals living in enclosed spaces.

     "It was made to challenge him but he's a bit of a wimp," said Tanvir's keeper.

1. From the first paragraph we can learn that ____.

A. tigers are often compared with chickens

B. tigers have nothing to do with chickens

C. tigers sometimes feed on chickens

D. tigers are generally not so cowardly

2. Which of the following is true?

A. It took Tranvir an hour and a half to come down from the tower.

B. The first tower did not have any effect in training the tiger.

C. It is uncertain whether Tanvir will go back up the tower once more.

D. Tanvir enjoyed his stay on the tower so much that he refused to come down.

3. What's the purpose of the passage?

A. To tell us how timid a tiger became in an English zoo.

B. To call on us to protect tigers that are being kept in enclosed spaces.

C. To emphasize the difficulties of creating suitable environments for enclosed animals.

D. To tell readers how to train wild animals, such as tigers.

4. What can be inferred from the passage?

A. In fact the tower structure was not difficult for Tanvir.

B. Zoo keepers knew the structure was a bit difficult for Tanvir.

C. Tanvir was the only tiger that was trained by the zoo keepers.

D. All tigers needed training before they were set free from the zoo.