下列几种症状和现象中，对家禽痛风诊断意义最大的是( )。A．关节腔有尿酸盐沉积 B．

党的某些政策可以起到法律的作用，是因为该项政策具有了国家意志的属性。 ( )

如图是电场中某区域的电场线分布图，a、b是电场中的两点，这两点比较

[      ]

A．b点的电场强度较大

B．a点的电势较低

C．负点电荷从a点移动到b点时电场力做正功

D．同一负点电荷放在a点所受的电场力比放在b点时受到的电场力小

阅读理解

     The breathless pace of everyday life made many people sleepless, said our reporter Wang Ling,

when talking about the World Sleep Day (WSD)with sleep experts in order to find out how to get a

better sleep.

     Cui Shuliang, founder of 51sleep.com, which provides online advice for those yearning for a sound

sleep, found many of his workmates suffering badly from poor sleep quality, as an IT technician in

earlier times. "Each morning, I would hear complaints from someone that kept waking up during the

night, or someone else who had to spend all night fighting for sleep."

     Pressed by busy city life, more and more people are suffering from sleep problems ranging from

insomnia to narcolepsy (嗜眠症). Some people may be able to fall asleep, but spend the whole time in

fear. A survey conducted by the Sleep Research Society (SRS) shows that about 40% of the population

is troubled by sleep disorders, which can result in lowered awareness and less productive days. Serious

insomnia can even lead to psychiatric problems.

     Professor Zhang Xi, director of the organization, says the focus of this year's World Sleep Day will

be on scientific ways to sleep. Professor Zhang Xi explained that the causes of sleep disorders differ

among cases, but more than 80% of his patients had trouble in sleeping because they always have a

nervous worried feeling that makes it impossible for them to relax. "That's why we keep suggesting

people pay more attention to sleep problems, since there remains a hidden danger in the physical and

mental condition. On the other hand, people with sleep problems should learn how to ease their mind

and relax themselves. Staying mentally and physically healthy, plus having healthy habits, is the best

way to realize a sound sleep."

1. What do we know about Cui Shuliang according to the text?

A. He founded a website with the help of his friends.

B. He is experienced in using information technology.

C. He was suffering from serious sleep problems.

D. He often complained about being sleepy.

2. What can be inferred from the text?

A. Most people cannot have a good sleep.

B. Most sleep problems are caused by fear.

C. Sleep disorders can lead to serious results.

D. The SRS is an organization of 51sleep.com.

3. According to Professor Zhang Xi,we know that ________.

A. the WSD's focus is on the importance of sleep this year

B. people have paid enough attention to sleep problems

C. keeping in good health is necessary for a good sleep

D. different sleep problems have the same cause

4. Most of Professor Zhang Xi's patients have difficulty in sleeping because of ________.

A. stress  

B. excitement

C. noise  

D. fear

5. The underlined word "sound"in the second paragraph means"________".

A. light and long  

B. quick and dreamful

C. heavy and short  

D. deep and peaceful

（）是人与动物在生活过程中获得个体经验，并由经验引起行为较持久的变化过程。

A.认知

B.学习

C.习惯

D.教学

计算机网络通信中，通常使用三种交换技术，其中不包括（）。