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There is no living creature that does not need sleep or complete rest every day.
If you want to know why, just try going without sleep for a long period of time I You will discover that your mind and body would easily be made angry and find it hard to think clearly or bring your attention on your work . So sleep is quite simply the time when the cells (细胞)of your body recover from the work of the day and build up supplies of energy for the next period of activity.
One of the things we all know about sleep is that we are unconscious(无知觉的)in sleep. We do not know what is going on around us. But that does not mean the body stops all the activities. The necessary organs(器官)continue to work during sleep, but most of the body functions (功能)are slowed down .
Your body temperature becomes lower when you are sleeping, which is the reason why people go to steep under some kind of covers. And even though you are unconscious, many of your reflexes(反应能力)still work. For example, if someone touches your foot slightly, you will put it away in your sleep, or even brush a fly from your forehead. You do these things without knowing it.
1．If a man did not sleep for a long time, ________.
[ ]
A．his mind would become tired but his body could work properly
B．It would be hard to make him angry
C．he would not think clearly or bring his attention on his work
D．he would become tired out but could keep on working
2．Sleep can not ________.
[ ]
A．make your body recover
B．build up your strength
C．add your cells
D．be helpful to your mind
3．When you are asleep, ________.
[ ]
A．it is hard for you to know what is going on around
B．you stop all the activities
C．your necessary organs stop working
D．your body functions are all slowed down
4．According to the text, we know that ________.
[ ]
A．when a person is sleeping, his body temperature becomes lower
B．in someone's sleep, he knows nothing except for his sleeping
C．it's possible for someone to brush a fly from his forehead with conscious in his sleep
D．one can sleep so deeply that even your touching his foot can not cause his reflex
查看习题详情和答案>>根据首字母或中文提示，补全单词。（20分）
【小题1】That kind of electronic dictionaries is well designed, and it is especially s______ for high school students learning English.
【小题2】“Are famous film stars always getting leading roles in movies?” “Not n________.”
【小题3】With the development of economy, a lot of companies have s______up in the industrial area.
【小题4】Going the shopping mall, you will see T-shirts in a wide v______ of colors intended for all kinds of people.
【小题5】The electric products produced in our company have good quality and usually a three-year g________.
【小题6】Professor Tudor is leaving for New York to attend an important international medical c________ next week.
【小题7】At the exhibition we saw a kind of record player, which had to be w________ up by hand and could only play for two minutes.
【小题8】This small electronic device is used to control an e_______ current passing through the machine.
【小题9】I’ve got two tickets for tonight’s concert given by the Russian artists. Would you like to a__________ me to go and enjoy it, Amy?
【小题10】I have total f_______in my best friends and believe that they are honest in this case.
【小题11】Their company bought the __________（专利） and applied the technology to create the new type of car.
【小题12】It is considered that digital TV is ___________(优越的) to satellite TV because it allows the same services to be delivered with clearer pictures.
【小题13】All of them said they didn’t like the design, but p________(就个人而言 ) I thought it was very fashionable.
【小题14】Five years after the International standards for digital TV were established ________（消费者）could have access to more than 200 channels in the USA.
【小题15】The Chinese __________（电信） industry is huge, and the amount of profit involved is unbelievably enormous.
【小题16】The boy tried to work out the maths problem by drawing a __________（平行线） between the two sides.
【小题17】I don’t think this program is practical and capable of calculating your_______（预算） for the year.
【小题18】By that time, digital TV ________（信号）had been received by 55 percent of households in the European country.
【小题19】With interactive TV programming, you can play along with game shows, respond to ________________（问卷） and chat to other viewers.
【小题20】These measures to be taken soon will all bring great _________________（方便） and delight to the citizens’ lives.