问题 单项选择题

第二代数据库系统是指

A.层次型数据库系统

B.网状型数据库系统

C.分布式数据库系统

D.关系型数据库系统

答案

参考答案:D

解析: 第二代数据库系统指支持关系模型的关系数据库系统。IBM研究实验室的研究员E.F. Codd于1970年发表了题为“大型共享数据库数据的关系模型”的论文,提出了数据库的关系模型,开创了数据库关系方法和关系数据库理论的研究,为关系数据库技术奠定了理论基础。目前,关系数据库系统仍然是主流的数据库系统,市场上的关系数据库产品包括IBM的DB2,Ingress,Oracle,Sybase,Informix,Mierosoft SQL Server等。

阅读理解

The rising costs of health care have become a problem for many countries in the world. To deal with this problem, it is reported that a big part of the government’s health budge(预算)has been used for health education and disease prevention instead of treatment. Actually, many kinds of diseases are preventable in many ways and preventing a disease is usually much cheaper than treating it. For example, people could avoid catching a cold if they dressed warmly when the weather starts getting cold. But many people get sick because they fail to do so, and have to spend money seeing a doctor.

Daily habits like eating more healthy food would have kept millions of families from becoming bankrupt(破产)if the patients had taken ways for early prevention. For example, keeping a balanced diet(均衡饮食), such as not consuming too much animal fat and trying to have enough vegetables and fruits, seems to be quite important.

One very effective and costless way of prevention is regular(定期的)exercise, which is necessary for a healthy mind and body. Regular exercise, such as running, walking, and playing sports is a good way to make people feel better.

In addition, health education plays a key role in improving people’s health. By giving people more information about health, countries could help people understand the importance of disease prevention and ways to achieve it. For example, knowing one’s family medical history is an effective way to help keep healthy. Information about health problems among close relatives will make them aware of what they should do to prevent certain diseases through lifestyle changes, which will work before it is too late.

However, paying more attention to disease prevention does not mean medical treatment is unimportant. After all, prevention and treatment are just two different means toward the same effect. In conclusion, we could save money on health care and treat patients more successfully if our country spends more money on health prevention and education.

小题1: What’s the meaning of the underlined word “consuming” in Paragraph 2?

A.Avoiding.

B.Producing.

C.Eating.

D.Cooking.小题2:What’s the best title of the passage?

A.Health or Illness?

B.Exercise or Illness?

C.Prevention or Education?

D.Prevention or Treatment?小题3:We can learn from the passage that ______.

A.more health education should be given

B.dressing warmly can prevent diseases

C.a balanced diet is cheaper than regular exercise

D.the government’s health budget should be increased

单项选择题