问题 单项选择题 A1/A2型题

下述动物的抗血清中,抗原与抗体的合适比例范围较窄的是()。

A.兔

B.绵羊

C.马

D.猴

E.豚鼠

答案

参考答案:C

解析:抗血清可分为R型和H型,R型抗血清是指免疫小动物产生的抗血清,如鼠、兔等,R型抗血清能和很少量的抗原结合,形成可见的沉淀线,具有较宽的抗原抗体比例范围;H型抗血清是指免疫大动物产生的抗血清,抗原与抗体的合适比例范围较窄,如马、骡等。

完形填空

第二部分:语言知识及应用(共两节,满分35分)

第一节:完形填空(共10小题;每小题2分,满分20分

阅读下面短文,掌握其大意,然后从21~30各题所给的A、B、C和D项中,选出最佳选项,并在答题卡上将该项涂黑。

Today, many people are starving to death. Recently, a man who wanted to understand the conditions of such people _21_    an experiment. He only ate one meal a day for a month but continued to work as he normally did.

During the first five days he was _22   _ at his regular mealtime, but after he had drunk a glass of water, his hunger 23_   . In the morning, when he ate his one meal, he ate quickly and had a_24   _ amount. During the next few days, he was not hungry during the day, but when he _25     a food stall (a place on which food is put to be sold), the smell of food caught his 26    . During the third and the fourth weeks, he had hunger pains and lacked physical strength. He looked forward to this one meal and ate it slowly, enjoying every bite. Without it, he knew he would he would have hardly enough 27      to work.

This experiment changed his attitude about some things. Having a cup of tea was not 28    a pastime. It also gave him strength. He more frequently noticed overweight people and people who threw away leftover food. He  29     the importance of food hungry person. He could no longer easily pass by a hungry beggar on the street. But most 30     , he could now sympathize(同情) in a similar way with the hungry people of the world.

21.  A. took along        B. carried out     C. put on        D. brought in

22.  A. hungry            B. angry                      C. happy          D. excited

23.  A. came about       B. broke out          C. set off         D. went away

24.  A. small           B. ordinary         C. large         D. common

25.  A. noticed          B. watched          C. recognized     D. glanced

26.  A. interest         B. eyes             C. imagination      D. attention

27.  A. power           B. spirit             C. energy              D. feeling

28.  A. just             B. still               C. yet                    D. exactly

29.  A. admitted               B. realized          C. remember         D. valued

30.  A. seriously        B. luckily           C. necessary        D. important

填空题