问题 单项选择题

对比剂应具备的条件是().

A.使用方便

B.刺激性小

C.理化性能稳定

D.易于吸收与排泄

E.以上都是

答案

参考答案:E

解析:对比剂应具备下列条件:①与人体组织密度对比相差大,显影清晰;②无毒性,刺激性小,副作用少;③理化性能稳定,长久存储不变质;④易于吸收与排泄,不在体内存留;⑤使用方便;⑥价格低廉。

阅读理解

Urban citizens(市民)can enjoy a more colorful life than rural citizens.Townspeople are well­informed because they have the easier access to news,while country people are uniformed because these districts are hard to get to.Urban traffic is so well­developed that the residents there often visit exhibitions and parks which are only a short bus ride away. For country people this is a major operation which involves considerable planning.Shopping,a necessary activity in everyday life is more convenient in the city than in the countryside. Townspeople can buy what they want at any time of a day.But rural residents go to town at most once a week.So after shopping they always stagger home loaded with heavy purchases. As for as meals and clothes concerned,townspeople are well­fed and well­dressed as there is an adequate(足够的)supply of goods.But rural residents are too busy to pay particular attention to them.It is for these reasons that more and more people are moving into the city and looking for a rest there.

On the contrary,some people are attracted by the rural area.Air pollution,noise and overcrowding which are the biggest problems confronting townspeople seem strange for rural residents.Medical studies have proved that rural residents can live longer than urban residents, because they are free from a polluted environment. In addition,the crime rate in the city is several times higher than in the countryside.As is known to all,the life in any city is much more expensive than in the countryside.So the safe, quiet and cheap life in the country appeals to(对……有吸引力)many city residents.

Either an urban or a rural area gives pleasure and trouble.But,I believe,the suburban area has the excellencies(优点)of both and is superior to both.As the automobile industry develops,more and more people will make their homes in suburban areas.

小题1:When visiting an exhibition in town,country people have to ________.

A.listen to local news

B.take a bus

C.make a careful plan

D.ask friends for help小题2:Paragraph 1 mainly tells us the differences between urban and rural life in ________.

A.communication,traffic and shopping

B.traffic,shopping and diet

C.education,living conditions and housing

D.traffic,medicine and shopping小题3:According to the passage,rural people are not as well­dressed as urban citizens mainly because________.

A.they live far away from town

B.they live a poorer life

C.they are busy with their work

D.they don't like to dress up小题4: For rural residents,the problems the urban citizens facing are________.

A.common

B.unfamiliar

C.well­known

D.unimportant

选择题