单选题The destruction of our natural resources and contamination of our food supply continue to occur, largely because of the extreme difficulty in affixing (把……固定) legal responsibility on those who continue to treat our environment with reckless abandon (放任). Attempts to prevent pollution by legislation, economic incentives and friendly persuasion have been met by lawsuits, personal and industrial denial and long delays-not only in accepting responsibility, but more importantly, in doing something about it. It seems that only when government decides it can afford tax incentives or production sacrifices is there any initiative for change. Where is industry's and our recognition that protecting mankind's great treasure is the single most important responsibility? If ever there will be time for environmental health professionals to come to the frontlines and provide leadership to solve environmental problems, that time is now. We are being asked, and, in fact, the public is demanding that we take positive action. It is our responsibility as professionals in environmental health to make the difference. Yes, the ecologists, the environmental activists and the conservationists serve to communicate, stimulate thinking and promote behavioral change. However, it is those of us who are paid to make the decisions to develop, improve and enforce environmental standards, I submit, who must lead the charge. We must recognize that environmental health issues do not stop at city limits, county lines, state or even federal boundaries. We can no longer afford to be tunnel-visioned in our approach. We must visualize issues from every perspective to make the objective decisions. We must express our views clearly to prevent media distortion and public confusion. I believe we have a three-part mission for the present. First, we must continue to press for improvements in the quality of life that people can make for themselves. Second, we must investigate and understand the link between environment and health. Third, we must be able to communicate technical information in a form that citizens can understand. If we can accomplish these three goals in this decade, maybe we can finally stop environmental degradation, and not merely hold it back. We will then be able to spend pollution dollars truly on prevention rather than on bandages.

单选题 {{I}}Questions 11—13 are based on the following dialogue about a job interview. You now have 15 seconds to read Questions 11—13.{{/I}}

单选题Questions 17—20 are based on the following passage about the changing family. You now have 15 seconds to read Questions 17—20.

单选题[此试题无题干]

单选题The author holds that weather rhymes ______.

单选题Questions 14—16 are based on the following talk about computer science education in Switzerland. You now have 15 seconds to read Questions 14—16.

单选题In the atmosphere, carbon dioxide acts rather like a one-mirror-the glass in the roof of a greenhouse which allows the sun's rays to enter but prevents the heat from escaping. According to a weather expert's prediction, the atmosphere will be 3℃ warmer in the year 2050 than it is today, if man continues to burn fuels at the present rate. If this warming up took place, the ice caps in the poles would begin to melt, thus raising sea level several meters and severely flooding coastal cities. Also the increase in atmospheric temperature would lead to great changes in the climate of the northern hemisphere, possibly resulting in an alteration of the earth's chief food-growing zones. In the past, concern about a man-made warming of the earth has concentrated on the Arctic because the Antarctic is much colder and has a much thicker ice sheet. But the weather experts are now paying more attention to West Antarctic, which may be affected by only a few degrees of warming: in other words, by a warming on the scale that will possibly take place in the next fifty years from the burning of fuels. Satellite pictures show that large areas of Antarcitic ice are already disappearing. The evidence available suggests that a warming takes place. This fits the theory that carbon dioxide warms the earth. However, most of the fuel is burnt in the northern hemisphere, where temperatures seem to falling. Scientists conclude, therefore, that up to now natural influences on the weather have exceeded those caused by man. The question is: Which natural cause has the most effect on the weather? On possibility is the variable behavior of the sun. Astronomers at one research station have studied the hot spots and "cold" spots (that is, the relatively less hot spots) on the sun. As the sun rotated, every 27.5 days, it presents hotter of "colder" face to the earth, and different aspects to different parts of the earth. This seems to have a considerable effect on the distribution of the earth's atmospheric pressure, and consequently on wind circulation. The sun is also variable over a long term: its heat output goes up and down in cycles, the latest trend being downward. Scientists are now finding mutual relations between models of solar-weather interactions and the actual climate over many thousands of years, including the last Ice Age. The problem is that the models are predicting that the world should be entering new Ice Age and it is not. One way of solving this theoretical difficulty is to assume a way of thousands of years while the solar effects overcome the inertia (惯性的) of the earth's climate. If this is right, the warming effect of carbon dioxide might thus be serving a useful counter-balance to the sun's diminishing heat.

单选题Evidence indicated that a high percentage of fathers were involved in the parenting process which amounted to

单选题Paragraphs 5 and 6 suggest that ______.

单选题When an Alexandrian wrote a book,

单选题Overthepasttenyears,thesharpincreaseinthesaleofpersonalcomputerswasduetoA.bettercomputergraphicsandsound.B.theenhancedversionofthePentiumprocessor.C.thesuccessoftheworld'sfirstmicroprocessor.D.successfulsalesofIntelchipsandMicrosoftsoftware.

单选题Scientists claim that air pollution causes a decline in the world's average air temperature. In order to prove that theory, ecologists have turned to historical data in relation to especially huge volcanic eruptions. They suspect that volcanoes effect weather changes that are similar to air pollution. One source of information is the effect of the eruption of Tambora, a volcano in Sumbawa, the Dutch East Indies, in April 1815. The largest recorded volcanic eruption, Tambora threw 150 million tons of fine ash into the stratosphere. The ash from a volcano spreads worldwide in a few days and remains in the air for years, It’s effect is to mm incoming solar radiation into space and thus cool the earth. For example, records of weather in England show that between April and November 1815, the average temperature had fallen 4.50 ℃. During the next twenty-four months, England suffered one of the coldest periods of its history. Farmers' records from April 1815 to December 1818 indicate frost throughout the spring and summer and sharp decreases in crop and livestock markets. Since there was a time lag of several years between causes and effect, by the time the world agricultural commodity community had deteriorated, no one realized the cause. Ecologists today warn that we face a twofold menace. The ever-present possibility of volcanic eruptions, such as that of Mt St Helens in Washington, added to man's pollution of the atmosphere with oil, gas, coal, and other polluting substances, may bring increasingly colder weather.

单选题{{B}}Passage 1{{/B}} Would you like to orbit the Earth inside the International Space Station? Now you can take a space holiday — for a price This is due to a recant decision by top space officials of the United States, Russia, Canada, Japan and the European Space Agency. Last April, American businessman Dennis Tito reportedly paid between twelve million and twenty million dollars to spend one week on the International Space Station NASA had strongly objected to the Russian plan to permit a civilian on the costly research vehicle After two years of negotiations, space officials have agreed on a process to train private citizens to take trips to the International Space Station. NASA recently agreed to conditions that will permit Russia to sell trips to the space station. The trips are planned by an American company called Space Adventures Limited of Arlington, Virginia. The company calls itself "the world's leading space tourism company". The company has sold a space trip to Mark Shuttle- worth, a South African businessman. In April, Mr Shuttleworth will be launched into space from the Baikonur Cosmodrome in Kazakhstan. Experts say the change in policy at NASA shows a new desire to use space vehicles for business and industrial purposes. In a speech to Congress last year, NASA official Michael Hawes said that the space agency had not considered civilian travel as one of the industries it wanted to develop, However, Mr Hawes said that private space travel could now be clone as long as safety measures are observed carefully. Yet, the average citizen will not be able to travel into space in the near future. Space Adventures Limited sells a training program for space flight that costs two hundred thousand dollars. That price does not include the cost of the trip to the International Space Station. That holiday in space costs twenty million dollars, Candidates for adventure space travel trips must be in excellent health and must pass difficult health tests, They must receive a lot of training. Besides, good English can help you prepare for a space holiday. This is because all successful candidates who wish to travel to the International Space Station must be able to read and speak English.

单选题You have probably seen ads (广告) in newspaper or on television for mail-order companies. Perhaps a catalogue (商品目录) has been sent to you. Why do people buy things they have not seen in person? Some people believe that things can be bought more cheaply by mail. Another good thing about buying by mail is that it is easier and more enjoyable to sit at home and work through a catalogue than to shop around the stores. With a catalogue from a large company, you have your own shop window for almost everything you want to buy. Buying from a catalogue is so easy. It saves the shopper's time and trouble. Sometimes, it saves the shopper's money, too. But people often buy more than they can really afford(付得起) or need, because many things look so good to them. They can probably pay a certain part of the full price—a down payment. Then they pay a certain amount of money every month until the goods is paid for in full. But by then they often find what they have bought are of no use at all.

单选题As regards social conventions, we must say a word about the well known English class system. This is an embarrassing subject for English people, and one they tend to be ashamed of, though during the present century class-consciousness has grown less and less, and the class system less rigid. But it still exists below the surface. Broadly speaking, it means there are two classes, the "middle class" and the "working class". (We shall ignore for a moment the old "upper class", including the hereditary aristocracy, since it is extremely small in numbers; but some of its members have the right to sit in the House of Lords, and some newspapers take a surprising interest in their private life.) The middle class consists chiefly of well to do businessmen and professional people of all kinds. The working class consists chiefly of manual and unskilled workers. The most obvious difference between them is in their accent. Middle class people use slightly varying kinds of "received pronunciation" which is the kind of English spoken by BBC announcers and taught to overseas pupils. Typical working class people speak in many different local accents which are generally felt to be rather ugly and uneducated. One of the biggest barriers of social equality in England is the two class education system. To have been to a so called "public school" immediately marks you out as one of the middle class. The middle classes tend to live a more formal life than working class people, and are usually more cultured. Their midday meal is "lunch" and they have a rather formal evening meal called "dinner", whereas the working man's dinner, if his working hours permit, is at mid-day, and his smaller, late evening meal is called supper. As we have said, however, the class system is much less rigid than it was, and for a long time it has been government policy to reduce class distinctions. Working class students very commonly receive a university education and enter the professions, and working class incomes have grown so much recently that the distinctions between the two classes are becoming less and less clear. However, regardless of one's social status, certain standards of politeness are expected of everybody, and a well bred person is polite to everyone he meets, and treats a laborer with the same respect he gives an important businessman. Servility inspires both embarrassment and dislike. Even the word "sir", except in school and in certain occupations (e.g. commerce, the army, etc.) sounds too servile to be commonly used.

单选题In order to get a stronger recovery, corporations are ______.