某油罐每米容积为158.362m3，该罐为70m3/h的速度收油，当零点时罐内油高为

乙数比40多20%，乙数是多少？

糖尿病酮症酸中毒的特征性表现是（）

A.昏迷

B.皮肤黏膜干燥

C.呼气有烂苹果味

D.二氧化碳结合力下降

E.呼吸深大

除B细胞和Th细胞外，与抗体产生有关的细胞还有

A．巨噬细胞

B．嗜酸性粒细胞

C．嗜碱性粒细胞

D．肥大细胞

E．靶细胞

应用原型化方法为预先定义提供了一种很好的选择和补充。应用原型化方法也需要进行假设，下列哪个不属于原型化方法开发策略的假设

A．并非所有的需求都能在系统的开发前准确地说明

B．有快速的系统建造工具

C．项目参加者不存在通信上的障碍

D．需要实际的、可供用户参与的系统模型

阅读理解。

     Most people feel lonely sometimes, but it usually only lasts between a few minutes and a few hours. This

kind of loneliness is not serious. In fact, it is quite normal. For some people, though, loneliness can last for

years. Now researchers say there are three different types of loneliness.

     The first kind of loneliness is temporary (暂时的). This is the most common type. It usually disappears

quickly and does not require any special attention. The second kind, situational loneliness, is a natural result

of a particular situation-for example, a family problem, the death of a loved one, or moving to a new place.

Although this kind of loneliness can cause physical problems, such as headaches and sleeplessness, it usually

does not last for more than a year. The third kind of loneliness is the most severe. Unlike the second type,

chronic (长期的) loneliness usually lasts more than two years and has no specific cause. People who

experience habitual loneliness have problems socializing and becoming close to others. Unfortunately, many

chronically lonely people think there is little or nothing they can do to improve their condition.

     Psychologists are trying to find ways to help habitually lonely people for two reasons: they are unhappy

and unable to socialize and there is a connection between chronic loneliness and serious illness such as heart

disease. While temporary and situational loneliness can be a normal, healthy part of life, chronic loneliness can

be a very sad, and sometimes dangerous condition.

1. How would you treat temporary loneliness according to the passage?

A. Talk to friends.

B. Just ignore it.

C. Go to see a doctor.

D. Ask your teachers for guidance.

2. "It" in the last sentence of the second paragraph refers to _____.

A. temporary loneliness

B. situational loneliness

C. a new place

D. sleeplessness

3. The topic of the 4 paragraph is that_______.

A. one problem of loneliness is a person's social contacts

B. we depend on various people for different reasons

C. lonely people don't have many social problems

D. lonely people don't have many friends

4. Why do psychologists want to help chronically lonely people?

A. Chronic loneliness can cause family problems.

B. Chronic loneliness can cause serious illness.

C. Chronic loneliness can not be overcome.

D. Such people are harmful to society.

5. What is the best title for the passage?

A. Three kinds of loneliness

B. Loneliness and Diseases

C. Loneliness and Social Contacts

D. Chronic Loneliness