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The, present growing interest in sign language was stimulated by ________.
A．a famous scholar in the study of the human brain
B．a leading specialist in the study of liberal arts
C．an English teacher in a university for the deaf
D．some senior experts in American Sign Language
答案
更多“The, present growing interest in sign language was stimulated by ________. A．a fam”相关的问题
第1题
The present growing interest in sign language was stimulated by______.
A．a leading specialist in the study of liberal arts
B．an English teacher in a university for the deaf
C．some senior experts in American Sign Language
D．a famous scholar in the study of the human brain
第2题
The actual amount of water in the plant at any one time, is only a very small part of what passes through it during its development. The processes of photosynthesis (光合作用), by which carbon dioxide and water are combined in the presence of chlorophyll (叶绿素) and with energy derived from light--to form. sugars, require that carbon dioxide from the air enter the plant. This occurs mainly in the leaf. The leaf surface is not solid but contains great numbers of minute openings, through which the carbon dioxide enters. The same structure that permits the one gas to enter the leaf, however, permits another gas--water vapor to be lost from it. Since carbon dioxide is present in the air only in trace quantities (3 to 4 parts in 10,000 parts of air) and water vapor is near saturation in the air spaces within the leaf (at 80F, saturated air would contain about 186 parts of water vapor in 10,000 parts of air), the total amount of water vapor lost is many times the carbon dioxide intake. Actually because of wind and other factors, the loss of water in proportion to carbon dioxide intake may be even greater. Also, not all of the carbon dioxide that enters the leaf is synthesized into carbohydrates.
A growing plant needs water for all of the following except ______.
A．forming sugars
B．sustaining actively growing parts as well as woody stems
C．absorbing mineral elements
D．taking in carbon dioxide from the air
第3题
The actual amount of water in the plant at any one time, however, is only a very small part of what passes through it during its development. The processes of photosynthesis, by which carbon dioxide and water are combined—in the presence of chlorophyll (叶绿素) and with energy derived from light to form. sugars, require that carbon dioxide from the air enter the plant. This occurs mainly in the leaves. The leaf surface is not solid but contains great numbers of minute (细小的) openings, through which the carbon dioxide enters. The same structure that permits the one gas to enter the leaf, however, permits another gas—water vapor to be lost from it. Since carbon dioxide is present in the air only in trace quantities (3 to 4 parts in 10, 000 parts of air) and water vapor is near saturation in the air spaces within the leaf (at 80 F , saturated air would contain about 186 parts of water vapor in 10,000 parts of air), the total amount of water vapor lost is many times the carbon dioxide intake. Actually, because of wind and other factors, the loss of water in proportion to carbon dioxide intake may be even greater than the relative concentrations of the two gases. Also, not all of the carbon dioxide that enters the leaf is synthesized into carbohydrates(碳水化合物).
A growing plant needs water for all of the following except ______.
A．forming simple sugars
B．keeping woody stems
C．keeping green
D．producing carbon dioxide
第4题
听力原文： (33) Our environment is being polluted faster than nature and man's present efforts can prevent it. Time is bringing us more people, and more people will bring us more industry, more motor vehicles, larger cities, and the growing use of man-made materials. What can explain and solve this problem？ The fact is that pollution is caused by man--by his desire for a modern way of life. (34)We make "increasing industrialization" our chief aim. For its sake, we are willing to sacrifice everything: clean air, pure water, good food, our health and the future of our children. There is a constant flow of people from the countryside into the cities, eager for the benefits of modern society. But as our technological achievements have grown in the last twenty years, pollution has become a serious problem. Isn't it time we stopped to ask ourselves where we are going and why？
It is like the story about the airline pilot who told his passengers over the loudspeaker: "I've some good news and some bad news. The good news is that we're making rapid progress at 530 miles per hour. The bad news is that we're lost and don't know where we're going." (35)The sad fact is that this becomes a true story when applied to our modern society.
(30)
A．Because there are many developing nations.
B．Because people use so many motor vehicles.
C．Because we have more and more industry.
D．Because we are building more vehicles.
第5题
听力原文： What has happened to the youth of today？ People Of the older generations ask this question. Yet, for some time now a movement has been developing among our young people. It is called "Straight Edge" and its followers are attempting to overcome the poisons of life. The leader of this movement is Ian Mckays, a former Washing ton singer. He was the person who set the goal of this movement: no smoking, no drinking, no drugs. Since its birth in 1981, the movement has spread to Europe and is growing worldwide.
Lutz Dinslage, 19, has been one of the movement's followers for a year now. "My friends first introduced me to the movement, and I became interested in it. I began to realize that I no longer wanted to create false feelings of happiness by smoking, drinking or taking drugs. I did not want to just mess around. For this reason I changed my attitude and my habits and decided to live out the principles of this movement."
At present it is still not clear whether Straight Edge will continue to develop into a promising movement of the future. However, one thing is certain: we are dealing with a trend that is proving that a healthier life style. among the young people is possible.
(30)
A．To create feelings of happiness for the young by singing.
B．To promote a healthier life style. among young people.
C．To close the gap between the older generations and the young.
D．To change the attitude of the young towards work.
第6题
If pollution continues to increase at the present rate, formation of aerosols (悬浮微粒) in the atmosphere will cause the onset (开始) of an ice age in about fifty years' time. This conclusion, reached by Dr. S. Rasool and Dr. H. Schneider of the United States Goddard Space Flight Centre, answers the apparently conflicting questions of whether an increase in the carbon dioxide content of the atmosphere will cause the Earth to warm up or increasing the aerosol content will cause it to cool down. The Americans have shown conclusively that the aerosol question is dominant.
Two specters haunting conservationists have been the prospect that environmental pollution might lead to the planet's becoming unbearably hot or cold. One of these ghosts has now been laid, because it seems that even an increase in the amount of carbon dioxide in the atmosphere to eight times its present value will produce an increase in temperature of only 2℃. which would take place over several thousand years. But the other problem now looms larger than ever.
Aerosols are collections of small liquid or solid particles dispersed in air or some other medium. The particles are all so tiny that each is composed of only a few hundred atoms. Because of this they can float in the air for a very long time. Perhaps the most commonly experienced aerosol is industrial smog of the kind that plagued London in the 1950s and is an even greater problem in Los Angeles today. These collections of aerosols reflect the Sun's heat and thereby cause the Earth to cool.
Dr. Rasool and Dr. Schneider have calculated the exact effect of a dust aerosol layer just above the Earth's surface in the temperature of the planet. As the layer builds up, the present delicate balance between the amount of heat absorbed from the Sun and the amount radiated from the Earth is disturbed. The aerosol layer not only reflects much of the Sun's light but also transmits the infrared radiation from below. So, while the heat input to the surface drops, the loss of heat remains high until the planet cools to a new balanced state.
Within fifty years, if no steps are taken to stop the spread of aerosols in the atmosphere, a cooling of the Earth by as much as 3.5℃ seems inevitable. If that lasts for only a few years it would start another ice age, and because the growing ice caps at each pole would themselves reflect much of the Sun's radiation it would probably continue to develop even if the aerosol layer were destroyed.
The only bright spot in this gloomy forecast lies in the hope expressed by Dr. Rasool and Dr. Schneider that nuclear power may replace fossil fuels in time to prevent the aerosol content of the atmosphere from becoming critical.
The author's main purpose in writing the article is to warn of ______.
A．warm weather
B．hot weather
C．a new ice age
D．a new iceberg
第7题
What can explain and solve this problem？ The fact is that pollution is caused by man-by his desire for a modern way of life. We make "increasing industrialization" our chief aim. For its sake, we are willing to sacrifice every thing: clean air, pure water, good food, our health and the future of our children. There is a constant flow of people from the countryside into the cities, eager for the benefits of modern society. But as our technological achievements have grown in the last twenty years, so pollution has be come a serious problem.
Isn't it time we stopped to ask ourselves where we are going and why？ It reminds one of the stories about the airline pilot who told his passengers over the loudspeaker, "I've some good news and some bad news. The good news is that we're making rapid progress at 530 miles per hour. The bad news is that we're lost and don't know where we're going." The sad fact is that this becomes a true story when applied to our modern society.
(30)
A．We are making too many vehicles.
B．We have more and more industry.
C．There are too many developing countries.
D．People use too many man-made materials.
第8题
What can explain and solve this problem？ The fact is that pollution is caused by man--by his desire for a modern way of life. We make "increasing industrialization" our chief aim. For its sake, we are willing to sacrifice everything: clean air, pure water, good food, our health and the future of our children. There is a constant flow of people from the countryside into the cities, eager for the benefits of modern society. But as our technological achievements have grown in the last twenty years, So pollution has become a serious problem.
Isn't it time we stopped to ask ourselves where we are going and why？ It reminds one of the stories about the airline pilot who told his passengers over the loudspeaker: "I've some good news and some bad news. The good news is that we're making rapid progress at 530 miles per hour. The bad news is that we are lost and don't know where we're going." The sad fact is that this becomes a true story when applied to our modern society.
(33)
A．It's because there are many developing nations.
B．It's because people use too many man-made materials.
C．It's because we have more and more industry.
D．It's because we are building more vehicles.
第9题
Why leaves change colors
If you are lucky, you live in one of those parts of the world where Nature has one last fun before settling down into winter's sleep. In those lucky places, as days shorten and temperatures become crisp, the quiet green palette(调色板) of summer leaves is transformed into the vivid autumn palette of reds, oranges, golds, and browns before the leaves fall off the trees. On special years, the colors are truly breathtaking,
How does autumn color happen？
For years, scientists have worked to understand the changes that happen to trees and shrubs in the autumn. Although we don't know all the details, we do know enough to explain the basics and help you to enjoy more fully Nature's multicolored autumn farewell. Three factors influence autumn leaf color-leaf pigments(色素), length of night, and weather, but not quite in the way we think. The timing of color change and leaf fall is primarily regulated by the calendar. That is, the increasing length of night. None of the other environmental in flounces -temperature, rainfall, food supply, and so on—are as unvarying as the steadily increasing length of night during autumn. As days grow shorter, and nights grow longer and cooler, biochemical processes in the leaf begin to paint the landscape with Nature's autumn palette.
Where do autumn colors come from？
-A color palette needs pigments, and there are three types that are involved in autumn color. Chlorophyll(叶绿素),which gives leaves their basic green color. It is necessary for photosynthesis(光合作用), the chemical reaction that enables plants to use sunlight to manufacture sugars for their food.
-Carotenoids(类胡萝卜素), which produce yellow, orange, and brown colors in such things as corn, carrots, and daffodils.
-Anthocyanins(花青素), which give color to such familiar things as red apples, grapes, blue berries, cherries, strawberries, and plums. They are water soluble and appear in the watery liquid of leaf cells.
Both chlorophyll and carotenoids are present in the chloroplasts of leaf cells throughout the growing season. Most anthocyanins are produced in the autumn, in response to bright light and excess plant sugars within leaf cells.
During the growing season, chlorophyll is continually being produced and broken down and leaves appear green. As night length increases in the autunm, chlorophyll production slows down and then stops and eventually all the chlorophyll is destroyed. The carotenoids and anthocyanins that are present in the leaf are then unmasked and show their colors.
Certain colors are characteristic of particular species. Oaks turn red, brown, or russet; hickories, golden bronze; aspen and yellow-poplar, golden yellow; dogwood, purplish red. Maples differ species by species: red maple turns brilliant scarlet; sugar maple, orange-red; and black maple, glowing yellow. Leaves of some species such as the elms simply shrink and fall, exhibiting little color.
The timing of the color change also varies by species. Sourwood in southern forests can become vividly colorful in late summer while all other species are still vigorously green. Oaks put on their colors long after other species have already shed their leaves. These differences in timing among species seem to be genetically inherited, for a particular species at the same latitude will show the same coloration in the cool temperatures of high mountains at about the same time as it does in warmer lowlands.
How does weather affect autumn color？
The amount and brilliance of the colors that develop in any particular autumn season are related to weather conditions that occur before and during the time the chlorophyll in the leaves is decreasing. Temperature and moisture are the main influences. A succession of warm, sunny days and cool, crisp but not freezing nights seems to bring about the most specta
A．Y
B．N
C．NG
第10题
They claim they want to dress as they please. But they all wear the same clothes. They set off in new directions in music.But somehow they all end up huddled round listening to the same record. Their reason for thinking or acting in thus-and-such a way is that the crowd is doing it. They have come out of their cocoon (蚕茧) —into a larger cocoon.
It has become harder and harder for a teenager to stand up against the popularity wave and to go his or her own way.Industry has firmly carved out a teenage market. These days every teenager can learn from the advertisements what a teenager should have and be. And many of today's parents have come to award high marks for the popularity of their children. All this adds up to a great barrier for the teenager who wants to find his or her own path.
But the barrier is worth climbing over. The path is worth following. You may want to listen to classic music instead of going to a party. You may want to collect rocks when everyone else is collecting records. You may have some thoughts that you don't care to share at once with your classmates. Well, go to it. Find yourself. Be yourself. Popularity will come —with the people who respect you for who you are. That's the only kind of popularity that really counts.
The author's purpose in writing this passage is to tell ______.
A．readers how to be popular with people around
B．teenagers how to learn to decide things for themselves
C．parents how to control and guide their children
D．people how to understand and respect each other
