单选题The reforms are motivated by a ______ concern for the unemployed.

单选题The potential of closed-circuit television and other electronic teaching tools is so great that it is inspiring to imagine "the school of tomorrow". Televised lesson will be given in a central building having perhaps four or five master studios. The lesson will be carried out into classrooms all over a city, or even an entire country. After a televised lesson has been given, the classroom teacher will take over for the allimportant "follow-up" period. The students will ask any troublesome questions, and difficult points will be cleared up through discussion. The teacher in the classroom will have additional electronic tools. On the teacher"s desk, the traditional bright red apple will have been replaced by a multiple-control panel (控制板) and magnetic tape players. The tape machines will run prerecorded lessons which pupils will follow by headphones. The lesson will be specifically connected closely to the student"s levels of ability. For instance, while the class as a whole studies history, each student will receive an individual history lesson directed to his particular level of ability. Should questions arise, the students will be able to talk directly to the teacher on individual "intercoms" (对讲装置) without disturbing the rest of the class. In this way, the teacher will be able to conduct as many as three classes at the same time.

单选题 One of the basic characteristics of capitalism is the private ownership of the major means of production-capital. The ownership of large amounts of capital can bring {{U}}(61) {{/U}} profits, as well as economic and political power. Some recent theorists, {{U}}(62) {{/U}} have argued that our society has moved to a new stage of {{U}}(63) {{/U}} that they call "postindustrial" society. One important change in such society is that the ownership of {{U}}(64) {{/U}} amounts of capital is no longer the only or even the most important {{U}}(65) {{/U}} of profits and influence; knowledge as well as {{U}}(66) {{/U}} capital brings profits and influence. There are many {{U}}(67) {{/U}} with the thesis above, not the least of {{U}}(68) {{/U}} is that wealthy capitalists can buy the experts and knowledge they need to keep their profits and influence. But this does not {{U}}(69) {{/U}} the importance of knowledge in an advanced industrial society, as the {{U}}(70) {{/U}} of some new industries indicates. {{U}}(71) {{/U}}, genetic engineering and the new computer technology have {{U}}(72) {{/U}} many new firms and made some scientists quite rich. In {{U}}(73) {{/U}} with criticism of the postindustrial society thesis, however, it must also be {{U}}(74) {{/U}} that those already in control of huge amounts of capital (i. e. , major corporations) soon {{U}}(75) {{/U}} to take most profits in these industries based on new knowledge. Moving down from the level of wealth and power, we still find knowledge increasingly {{U}}(76) {{/U}}. Many new high-tech jobs are being created at the upper-skill, low-paying service {{U}}(77) {{/U}}. Something like a caste line is emerging centered around knowledge. Individuals who fall too far behind in the {{U}}(78) {{/U}} of knowledge at a young age will find it almost impossible to catch up later, no matter how hard they try, Illiteracy in the English language has been a severe {{U}}(79) {{/U}} for many years in the United States, but we are also moving to the point when computer illiteracy will hinder many more people and {{U}}(80) {{/U}} them to a life of low-skill and low paid labor.

单选题"The world"s environment is surprisingly healthy. Discuss." If that were an examination topic, most students would tear it apart, offering a long list of complaints: from local smog (烟雾) to global climate change, from the felling (砍伐) of forests to the extinction of species. The list would largely be accurate, the concern legitimate. Yet the students who should be given the highest marks would actually be those who agreed with the statement. The surprise is how good things are, not how bad. After all, the world"s population has more than tripled during this century, and world output has risen hugely, so you would expect the earth itself to have been affected. Indeed, if people lived, consumed and produced things in the same way as they did in 1900 (or 1950, or indeed 1980), the world by now would be a pretty disgusting place, smelly, dirty, toxic and dangerous. But they don"t. The reasons why they don"t, and why the environment has not been ruined, have to do with prices, technological innovation, social change and government regulation in response to popular pressure. That is why today"s environmental problems in the poor countries ought, in principle, to be solvable. Raw materials have not run out, and show no sign of doing so. Logically, one day they must: the planet is a finite place. Yet it is also very big, and man is very ingenious. What has happened is that every time a material seems to be running short, the price has risen and, in response, people have looked for new sources of supply, tried to find ways to use less of the material, or looked for a new substitute. For this reason prices for energy and for minerals have fallen in real terms during the century. The same is true for food. Prices fluctuate, in response to harvests, natural disasters and political instability; and when they rise, it takes some time before new sources of supply become available. But they always do, assisted by new farming and crop technology. The long term trend has been downwards. It is where prices and markets do not operate properly that this benign (亲戚) trend begins to stumble, and the genuine problems arise. Markets cannot always keep the environment healthy. If no one owns the resource concerned, no one has an interest in conserving it or fostering it: fish is the best example of this.

单选题The effect of the shock will soon ______.

单选题You look pale, What's wrong ______ you?A. withB. byC. onD. at

单选题The molecules of carbon dioxide in the Earth"s atmosphere affect the heat balance of the Earth by acting as a one-way screen. Although these molecules allow radiation at visible wavelengths, where most of the energy of sunlight is concentrated, to pass through, they absorb some of the longer-wavelength , infrared emissions radiated from the Earth"s surface, radiation that would otherwise be transmitted back into space. For the Earth to maintain a constant average temperature, such emissions from the planet must balance incoming solar radiation. If there were no carbon dioxide in the atmosphere, heat would escape from the Earth much more easily. The surface temperature would be so much lower that the oceans might be a solid mass of ice. Today, however, the potential problem is too much carbon dioxide. The burning of fossil fuels and the clearing of forests have increased atmospheric carbon dioxide by about 15 percent in the last hundred years, and we continue to add carbon dioxide to the atmosphere. Could the increase in carbon dioxide cause a global rise in average temperature, and could such a rise have serious consequences for human society? Mathematical models that allow us to calculate the rise in temperature as a function of the increase indicate that the answer is probably yes. Under present conditions a temperature of - 18°C can be observed at an altitude of 5 to 6 kilometers above the Earth.Below this altitude (called the radiating level) , the temperature increasesby about 6°C per kilometer approaching the Earth"s surface, where the average temperature is about 15°C. An increase in the amount of carbon dioxide means that there are more molecules of carbon dioxide to absorb infrared radiation. As the capacity of the atmosphere to absorb infrared radiation increases, the radiating level and the temperature of the surface must rise. One mathematical model predicts that doubling the atmospheric carbon dioxide would raise the global mean surface temperature by 2.5°C： This model assumes that the atmosphere"s relative humidity remains constant and the temperature decreases with altitude at a rate of 6. 5 °C per kilometer. The assumption of constant relative humidity is important, because water vapor in the atmosphere is another efficient absorber of radiation at infrared wavelengths. Because warm air can hold more moisture than cool air, the relative humidity will be constant only if the amount of water vapor in the atmosphere increases as the temperature rises. Therefore, more infrared radiation would be absorbed and reradiated back to the Earth"s surface. The resultant warming at the surface could be expected to melt snow and ice, reducing the Earth"s reflectivity. More solar radiation would then be absorbed, leading to a further increase in temperature.

单选题______, I shall still have to work in the garden. A. As the sun is hot B. Hot as the sun is C. As hot the sun is D. Hot as is the sun

单选题______ Contract No．DSG 267 and BSG 268, we agree to D/P payment terms for these contracts. A．With regard to B．With view to C．In view of D．In regard to

单选题She has bought a pair of glasses, which she can never ______ when reading books. A. do with B. do up C. do away D. do without

单选题We have some stock left, and shall be able to meet your requirements if you wish to ______ your last order. A．repeat B．triplicate C．dedicate D．indicate

单选题To save more money you'll need to be more Ufrugal/U.

单选题We should never {{U}}underestimate{{/U}} influence we can have on the children we love.

单选题The study of how words are combined to form sentences is called ______.

单选题Be careful! Don’t ______ your drink on the table.

单选题Tim is dubious about diet pills which advertise quick weight less.