问题 单项选择题 B型题

若蛔虫病患儿突起剧烈腹痛难忍,以右上腹为主,放射至右肩部及背部,并伴有频繁呕吐,出现这些临床表现的原因可能是()

A.蚴虫移行发育

B.蚴虫钻孔

C.成虫游走

D.成虫钻入胆道

E.成虫代谢物被吸收

答案

参考答案:D

解析:蛔虫虫体的代谢物质或毒素被吸收,可引起小儿易惊、磨牙、异食癖等。血中嗜酸性粒细胞显著增高。所以第1题正确答案是E。短期内大量吞食感染性蛔虫卵,移行至肺使细支气管上皮细胞脱落、肺部出血而造成肺蛔虫病。常引起蛔虫性哮喘,严重者可致肺炎。患者发热、乏力、阵发性咳嗽,胸闷、痰少,偶有痰中带血丝。所以第2题正确答案是A。当受到高热、驱虫不当等刺激时,蛔虫可钻空乱窜,引起胆道蛔虫病、胆结石、急性阑尾炎等。所以第3题正确答案是D。

单项选择题
阅读理解

阅读理解。

     Have you ever imagined what the world will be like in the near future? A recent study shows that the

world in 2100 will be more crowded, more polluted and less stable ecologically than the world we live in

now. Visible ahead is serious stress involving population, resource and environment. Despite greater food

output, people in the world will be poorer in many ways than they are today.

     For hundreds of millions of the extremely poor, the outlook for food and other necessities of life will

be no better, for many it will be worse.

     While the economies of the developing countries are expected to grow at a faster rate than those of

the industrialized nation, the total national product per head in most less developed countries remains low.

The existing gap between the rich and poor nations will further widen.

     World food production is estimated to increase by 90 percent from 2000 to 2100. Most of that increase

goes to the countries that already have relative higher per-head food consumption. Mean-while, per-head

consumption of food in the developing countries will scarcely improve or will actually fall far below the

present inadequate level. What is worse is that prices for food are expected to double.

     As a result, many less developed countries will have increasing difficulties meeting energy needs. For

the one quarter of mankind that depends primarily on wood for fuel, the outlook is not hopeful.

     Regional water shortage will become more severe. In the 1970-2100 period population growth will

require twice as much water as it does today in nearly half the world. Still greater increases would be needed

to improve standards of living. Development of new water supply will become more costly.

1. According to the passage, in 2100 although output of food will be greater, _____.

A. people will have sufficient food supplies

B. the resource will become more than enough

C. in most developing countries people will have less food than they have today

D. the living standards of the world's population will improve greatly

2. According to the author, in 2100 for many poor people, _____.

A. things will get even worse

B. things will be a little better

C. it will be necessary for them to improve their housing

D. it will be impossible to obtain enough necessities of life

3. In the 2000-2100 period, the large proportion of global increase of food production goes _____.

A. to 90 percent as estimated

B. to any country in the world that needs it

C. to developing countries

D. to those countries that already have high per-head consumption

4. The passage is mainly concerned about _____.

A. the future problems in the world

B. water and air pollution

C. water and food shortages

D. food production and consumption