乙烷在光照条件下与氯气发生取代反应,理论上得到的氯代物最多有几种 ( ) A.5

题型:选择题

问题:

乙烷在光照条件下与氯气发生取代反应,理论上得到的氯代物最多有几种  (  )

A.5种      

B.6种

C.8种

D.9种

考点:结构简式结构式
题型:选择题

阅读理解诶。

     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

or 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

last more than two yeas and has no specific cause. People who experience habitual loneliness have problems

socializing and becoming close to others. Unfortunately, many chronically lone people think there is little or

nothing they can do to improve their condition.

     Psychologists (心理学家) agree that one important fact in loneliness is a person's social contacts, e.g,

friends, family members, co-workers, etc. We depend on various people for different reasons. For instance,

our families give us emotional support, our parents and teachers give us guidance, and our friends share similar

interests and activities. However, psychologists have found that, though lone people may have many social

contacts, they sometimes feel they should have more. They question their own popularity.

     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. The topic of the 4th paragraph is that _____. [ ]

A. lonely people don't have many friends

B. lonely people don't have many social problems

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

D. we depend on various people for different reasons

3. 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 cannot be overcome

D. A, B, and C are all correct

4. What is the best title of the passage? [ ]

A. Three kinds of Loneliness

B. Loneliness and Diseases

C. Loneliness and Social Contacts

D. Chronic Loneliness

题型:选择题

2008年北京举办了奥运会。今天奥运会的名称来源于古代什么人四年一次的奥林匹亚赛会[ ]

A.印度人

B.埃及人

C.希腊人

D.苏美尔人

题型:选择题

喷浆过程中根据()决定开水量大小。

A.链带速度

B.铸铁块度

C.铁块型号

题型:选择题

框架结构的建筑物以( )为承重骨架。

A.墙体
B.柱和屋架
C.梁、柱、板
D.钢筋混凝土墙

题型:选择题

作为组织氧合作用的指标是()

A.CaO2

B.PvO2

C.PaO2

D.SaO2

E.P(A—a)O2

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