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Dreams may be influenced(影响) by different things that are present during sleep.If a person is cold,he may dream that he is out in a snowstorm.Worries or anger may also influence the content of a dream.?
Some people think that they seldom dream,other people are quite sure that they do not dream at all.Studies of human sleep have shown,though,that everyone dreams every night.If a person thinks he does not dream,it is because he does not remember dreaming when he wakes up.Usually,a person may dream three to seven times for a total of one to two hours of dreaming every night.?
Perhaps you are wondering just how research workers can be sure that a person is dreaming.The story behind the discovery is an interesting one.?
During their research studies of human sleep,Dr.Kleitman and his assistant noticed that a person sleeping made sudden eye movements.These movements occurred at least several times a night.When a sleeper was awakened during these periods of eye movement it was learned that he had been dreaming.In most cases,the dreamer could then recall(回忆) his dream.The person's eye movements,scientists believe,were caused by the movements of his eyes as he followed the events of the dream.?
Not only does everyone dream,but it seems that we all need to dream.One theory is that dreaming gives us a chance to escape from the rules of our real world.In dreams we can see our wishes come true.We can be rich,powerful,and successful.?
Another theory is that in our dream we are trying to work out problems that have troubled us during waking moments.?
Whatever the explanation is,we all do dream,and dreaming is necessary and important to us.?
1.According to the selection,the research studies of human sleep show_____.?
A.few people dream at night?
B.some people dream three times every night?
C.some people may dream all the time during sleep?
D.everyone dreams several times every night?
2.According to the research studies,you may dream of a fire-engine________.?
A.when your alarm clock is ringing?
B.when you feel hungry?
C.when you are cold?
D.when you are ill?
3.According to the selection,you can discover what a sleeping person is dreaming of by _____.?
A.watching him (her) closely?
B.waking him(her) up when he(she) makes sudden eye movements?
C.watching his(her) eye movements?
D.talking to him while he (she) is sleeping?
4.Dreaming is important to us_______.?
A.because scientists help us in our dreams?
B.because we can relax and enjoy a care free life in our dreams?
C.because we can have a good rest?
D.because we can make discoveries in our dreams?
查看习题详情和答案>>In 1826, a Frenchman named Niepce needed pictures for his business. But he was not a good artist. So he invented a very simple cameras. He put it in a window of his house and took a picture of his yard. That was the first photograph.
The next important date in the history! of photography was 1837. That year, Daguerre, another French, took a picture of his studio. He used a new kind of camera and a different process. In his pictures, you could see everything very clearly, even the smallest details. This kind of photograph was called a daguerreotype.
Soon, other people began to use Daguerre's process. Travelers brought back daguerreotypes from all around the world. People photographed famous buildings, cities and mountains.
In about 1840, the process was improved. Then photographers could take pictures of people and moving things. The process was not simple. The photographers had to cary lots of films and processing equipment. But this did not stop the photographers, especially in the United States. After 1840s daguerreotype artists were popular in most cities.
Mathew Brady was a well - known American photographer. He took many pictures of famous people. The pictures were unusual because they were very life - like and full of personality (个性).
Brady was also the first preson to take pictures of war. His 1862 Civil War pictures showed dead soldiers and ruined cities. They made the war seem more real and more terrible.
In the 1880s, new inventions began to change photography... Photographers could buy films readymade in rolls(卷). So they did not have to make the film themselves. Also, they did not have to process the film immediately. They could bring it back to their studios and develop it later meaning that they did not have to carry lots of equipment. And finally, the invention of the small handheld camera made photography less expensive.
With the small camera, anyone could be a photographer. People began to use cameras just for fun. They took pictures of their families, friends and favorite places. They called these pictures" snapshot".
Photographs became very popular in newspapers in the 1890s. Soon magazines and books also used documentary photographs. These pictures showed true events and people. They were much more real than drawing.
Photography also turned into a form of art by the end of the 10th century. Some photographs were not just copies of the real world. They showed ideas and feelings, like other art forms.
The passage is mainly about ________.
A. the inventoin of cameras
B. a kind of new art - photography
C. the development of photography
D. the important dates in the history of photography
The first pictures of a war were taken by________.
A. a French photographer in the 1840s
B. an American photographer in the 1860s
C. a German reporter in the 1880s
D. a French artist in the 1890s
Photography can also be an art form because artists can ________.
A. take anything they like
B. keep a record of real life
C. take photos of the famous
D. show ideas and feeling in pictures
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完形填空
阅读下面短文,掌握其大意,然后从以下各题所给的四个选项(A、B、C和D)中,选出最佳选项。
If you do not use your arms or your legs for some time, they will become weak; and when you start using them again, they will slowly become strong again. 1 knows this, and nobody would think of 2 the fact.
Yet there are many people who 3 to know that the memory works in the same way. When someone says that 4 has a good memory, he 5 means that he keeps his memory 6 practice by exercising it very 7 , either consciously or unconsciously. When someone else says that his memory is 8 , he means that he does not give it enough 9 to become strong. The position is exactly the same as that of 10 people, one of 11 exercises his arms and legs by playing balls, while the other 12 in a chair or a car all day. If a friend of yours says that his arms are weak, we know that it is his own 13 . But if he tells us that he has a poor memory, 14 of us think that his parents are to blame, or that he is just 15 , and few of us realize that it is just as it was his arms or legs that were weak. Not all of us can become very strong in body or very clever in mind, 16 all of us can improve our strength and our memory by the same means
17 .
Have you ever 18 that people who cannot read or write usually have 19 memories than those who can? Why is this? Of course, because they cannot write down something in a little notebook or something else. They have to remember names, places, songs and stories; so their memory is always being exercised.
In a word, if you want to have a good memory, 20 practise remembering.
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