Today, ultrasonic(超声的) waves are being put to work in laboratories and factories - 高中英语试题 - 超级试练试题库

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Today, ultrasonic(超声的) waves are being put to work in laboratories and factories. If an ultrasound generator is placed in a liquid, the waves move the liquid back and forth hundreds of thousands of times each second. This causes materials to mix quickly or to dissolve(使分解，使溶解) in liquids. Paint manufacturers(制造商) use ultrasound to do a better job of blending colors. The companies that make film for your camera find that mixing chemicals by the use of sound waves will produce a more sensitive film.
The new lightweight(轻量的) type of washing machine uses ultrasonic waves to get clothes clean. Its special ultrasound generator is put into a pail of soapy water containing the soiled clothes. The sound waves drive the soapy water back and forth through the cloth so fast that everything is soon clean. There is also a new kind of dishwasher that works in much the same way.
Ultrasonic waves can shake a liquid so fast that tiny holes form all through it. The liquid is actually torn apart by this action. Almost as soon as these holes are made, they fall together again. The result is a powerful pounding action. In the dairy industry this is used for the double purpose of making homogenized(使均匀，使匀质) milk and sterilizing(使无菌) it at the same time. If you look at some raw milk with a microscope, you find that it is made up of little drops of butter fat floating around in a watery liquid. In order to make milk easier to digest, these fat droplets(微粒) may be broken up by forcing the milk through very small openings. The result is called homogenized milk. When the ultrasonic method is used, the sound waves not only break up the droplets but also kill the germs in the milk by pounding them to pieces. (from www.nmet168.com)
1. Why does a paint manufacturer use ultrasound to do a better job of blending colors?
A. Because it is cheap to use ultrasound to blend colors.
B. Because the waves move the liquid so quickly that it can make materials mix quickly or dissolve in liquids.
C. Because they can mix chemicals by the use of sound waves.
D. Because the waves can clean the paint.
2. What properties does ultrasound wave have?
A. Homogenizes and sterilizes the milk.   B. Mix materials and break droplets.
C. Kill germs and sterilize milk.          D. Move liquids quickly.
3. What exists in the raw milk?
A. Little drops of butter fat.       B. Small holes.
C. Fat droplets and germs.        D. Chemicals.
4. Where is ultrasound wave not used?
A. In the paint manufacture.                  B. In the shop mixing bread flour.
C. In the film-making company.      D. In the dairy industry.

答案

1-4 BDCB

解析

1. B 事实细节题。根据其上句 This causes materials to mix quickly or to dissolve(使分解，使溶解) in liquids 可知，答案选 B。
2. D 事实细节题。根据文章最后一段的第 1 句 Ultrasonic waves can shake a liquid so fast that tiny holes form all through it可知，答案选 D。
3. C 事实细节题。根据文章最后一段的内容，特别是最后一句 When the ultrasonic method is used, the sound waves not only break up the droplets but also kill the germs in the milk by pounding them to pieces 可知，答案选 C(from www.nmet168.com)。
4. B 推理判断题。根据文章第 1 段最后提到的 Paint manufacturers(制造商)…以及The companies that make film… 两句排除选项 A、C，根据第 3 段第 5 句的 In the dairy industry this is used for… 排除选项 D，从而得出答案是 B。

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Probably you have seen photos of the Grand Canyon（峡谷）, the great valley in the desert country of Arizona. But you must go there yourself to feel its true size and beauty. The Grand Canyon is one of the greatest natural wonders of the world
The Colorado River formed the Grand Canyon over millions of years. Slowly, the river cut down through hard rock. At the same time, the land was rising. Today the canyon is 1.5 kilometers and 445 kilometers long. The oldest rocks at the bottom of the canyon are more than 1 billion years old. The width varies from about 200 meters to 29 kilometers across. The rim or top of the canyon is about 2,300 meters above sea level on the South Rim, and about 3,000 meters on the other side. As a result, there are different kinds of plants and animals on opposite sides of the canyon. The South Rim is dry desert country. The North Rim has tall forests.
The canyon looks different at different times of day, and in different seasons and weather. At sunrise and sunset the red, gold, brown and orange colors of the rocks are especially clear and bright. In winter, the canyon is partly covered with snow.
The view from the South Rim of the Grand Canyon is the best. Most visitors come here and stay in campgrounds or hotels. Every point along the canyon’s edge offers a different view.
The North rim of the Canyon is quieter. It takes all day to drive there from the South Rim because there is only one bridge across the Colorado River. On the way, you go through Navado Indian lands, and a colorful pink desert called “The Painted Desert”.
11. The best way to feel the true beauty of the Grand Canyon is to________.
A. see its photographs            B. listen to the report about it
C. watch its introduction on TV    D. go there yourself and visit it
12. According to the second paragraph, ________.
the Grand Canyon has a short history
B. its size never changed in the history
C. the Grand Canyon was formed by the earthquake
D. You can enjoy different scenery on different sides of the canyon
13. The scene the canyon is ________.
various depending on different time and places
the same
various depending on different time
various depending on different places
14. If you want to visit the North Rim from the South Rim, you________.
can go there in many directions
won’t spend much time on the way
can visit The painted Desert on the way
needn’t go across any bridges
15. If you want to have a visit to the Grand Canyon, you’d better go to _______.
A. the North Rim                  B. the South Rim
C. the bottom                     D. Navado Indian Lands

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In only two decades Asian Americans have become the fastestgrowing U. S. minority. As their children began moving up through the nation schools, it became clear that a new class of academic achievers was emerging. Their achievements are reflected in the nation’s best universities, where mathematics, science and engineering departments have taken on a decidedly Asian character. This special liking for mathematics and science is partly explained by the fact that Asian-American students who began their education abroad arrived in the U. S. with a solid grounding in mathematics but little or no knowledge of English. They are also influenced by the promise of a good job after college. Asians feel there will be less unfair treatment in areas like mathematics and science because they will be judged more objectively. And the return on the investment in education is more immediate in something like engineering than with an arts degree.
Most AsianAmerican students owe their success to the influence of parents who are determined that their children take full advantage of what the American educational system has to offer. An effective measure of parental attention is homework. Asian parents spend more time with their children than American parents do, and it helps. Many researchers also believe there is something in Asian culture that breeds success, such as ideals that stress family values and emphasize education.
Both explanations for academic success worry Asian Americans because of fears that they feed a typical racial image. Many can remember when Chinese,Japanese and Filipino immigrants were the victims of social isolation. Indeed, it was not until 1952 that laws were laid down giving all Asian immigrants the right to citizenship.
8.While making tremendous achievements at college, AsianAmerican students .
A.feel they are mistreated because of limited knowledge of English
B.are afraid that their academic successes bear a strong Asian character
C.still worry about unfair treatment in society
D.generally feel it a shame to have to depend on their parents
9.What are the major factors that determine the success of Asian Americans?
A.A solid foundation in basic mathematics and Asian culture.
B.Hard work and intelligence.
C.Parents’ help and a limited knowledge of English.
D.Asian culture and the American educational systerm.
10.Few Asian American students major in human sciences mainly because .
A.their English is not good enough
B.they are afraid they might meet with unfair judgment in these areas
C.there is a wide difference between Asian and Western cultures
D.they know little about American culture and society
11.Why do “both explanations” (Para. 3) worry Asian Americans?
A.They are afraid that they will again be isloated from American society in general.
B.People will think that Asian students rely on their parents for success.
C.Asian Americans will be a threat to other minorities.
D.American academic achievements have taken on too strong an Asian character.

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How the iron of tomorrow (the first Self Clean Iron)can change your lifestyle today?
General Electric introduces the iron of tomorrow. The iron can clean itself. Inside where irons get dirty. Because it cleans itself each and every time you empty it.How? With a push of a magic blue button.
The magic blue button.The first thing you’ll notice that’s different about this iron is the blue button on the side. It’s marked “Self Clean”. Push this blue button, and you can wash out loose mineral deposits that remain and block up inside. Push this button, and you’ve made life a lot easier.
Less chance of brown spotsSure, Self Cleaning Iron is going to cut down on brown spots. (Those ugly spots that happen on nice, cleanly pressed clothes.) Because a Self Cleaning Iron becomes clean each time you press that magic blue button.Steams much longerCommon sense tells you that if you’ve an iron that blocks less often it has to stay younger for a long period of time. In other words, it steams much longer. That’s another joy of owning General Electric’s Self Cleaning Iron.What does it mean to youToday you are doing so much more than just running a house and running after the kids. You’re working. You’re going to school. It’s all part of your lifestyle. The iron can change that lifestyle. By giving you less trouble before you iron. If we can make it easier for you to be a better wife, a better mother, a better housemaker, we want to. The new Self Cleaning Iron is another one of Home-Makers from General Electric.
Lifestlye.We’re with yours. GENERAL ELECTRIC
9.This passage is ______.
A.an introduction to General Electric     B.an operating instruction of Self Cleaning Iron
C.an advertisement of Self Cleaning Iron D.a description of the change of lifestyle
10.This iron can clean itself by ______.
A.empting itself                       B.washing out mineral deposits
C.blocking up mineral deposits          D.giving off more steam
11.According to the passage, what is most likely to attract the customers?
A.It is made by General Electric.
B.The iron will not produce mineral deposits.
C.There will be fewer brown spots on pressed clothes.
D.Their clothes will be cleaned at the same time.
12.Self Cleaning Iron can help change your lifestyle because ______.
A.you can run your house better         B.you don’t have to run after the kids
C.you can use it while you are working    D.we want you to be a better housemaker

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The volcano is one of the most surprising frightening things of nature. Maybe you have seen pictures of these " fireworks " of nature. Sometimes when a volcano erupts, a very large wall of melted rock moves down the side of a mountain. It looks like a " river of fire". Sometimes volcanoes explode, throwing the melted rock and ashes high into the air. But where does this melted rock come from?
The earth is made up of many layers (层). The top layer that we see is called the crust. Under the crust are many layers of hard rock. But far, far beneath the crust the rock is so hot that it is soft. In some places it even melts. The melted rock is called magma. Sometimes the magma breaks out to the surface through cracks (裂缝) in the crust. These cracks are volcanoes.
Most people think of mountains when they think of volcanoes. But not every mountain is a volcano. A volcano is simply the opening in the earth from which the magma escapes. The hot magma, or lava as it is called, cools and builds up on the surface of the earth. Over thousands of years, this pile of cooled lava can grow to be very, very big. For example, the highest mountain in Africa, Kilimanjaro, is a volcano. It rises more than 16,000 feet above the ground around it.
8. The underlined word "erupts" means ______.
A. moves down   B. breaks away    C. builds up       D. suddenly throws out lava
9. Which words in the passage have the same meaning as "melted rock"?
A. volcano and crust                B. crust and hard rock
C. magma and lava                D. volcano and magma
10. Which is the correct order of the layers of the earth (beginning with the top layer)?
A. crust — hard rock — magma — soft rock
B. crust — hard rock — soft rock — magma
C. agma — soft rock — hard rock — crust
D. volcano — cracks — magma — crust
11. The best title of the passage should be______.
A. The Volcano        B. Kilimanjaro Volcano   C. The Mountains  D. The Melted Rock

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