单选题U. S. health officials are increasing surveillance measures at doctors' offices and international borders to guard against the spread of swine flu. Washington also has begun dispersing medicine from a federal stockpile. The Centers for Disease Control and Prevention says there have been only mild cases of swine flu in the United States, but experts remain on guard. Acting agency director, Richard Besser, says the epidemic in Mexico prompted U. S. doctors to begin monitoring actively for possible infections. "We are asking doctors when they see someone who has flu-like illness who has traveled to an affected region, to do a culture, take a swab in the nose and send it to the lab so we can see: is it influenza, is it this type?" he said. Speaking Sunday at the White House, Besser said the extra detection efforts have enabled officials to find more infections than under normal circumstances. He also says he expects the number of infections will rise and the illness will spread to other U. S. regions, as doctors continue to monitor the problem. The Centers for Disease Control and Prevention says it does not recommend people travel to Mexico, where the outbreak of swine flu is centered and more than 100 deaths have been reported. But officials have not ordered a travel ban to the country. Homeland Security Secretary Janet Napolitano says, instead, airlines have the option of screening passengers on flights from Mexico. "We are letting air carriers and our employees at the gates on those flights make sure that they are asking people if they are sick; and if they are sick, that they should not board the plane, " she said. Denise Korniewicz, an infectious disease expert at the University of Miami, says officials should take bolder steps to screen passengers at international borders, as Japan and other Asian nations are doing. "We have a very transient population here. And Japan has taken a lot of precautions. What Japan is doing is they are making everyone take a temperature when they get off the airplane, " she said. "As far as I am concerned, I think that is a good idea. " U. S. officials say they are holding off on more aggressive actions because the outbreak has been limited in the United States and they do not want to cause a health scare. Korniewicz says around the country health centers are putting in place emergency response measures aimed at limiting disease outbreaks.

单选题Why mass production was developed as an alternative?

单选题As a measure of money flow, the balance of payments differs from the balance of trade primarily because of its greater

单选题Read the following text. Choose the best word(s) for each numbered blank and mark A, B, C or D on. Most worthwhile careers require some kind of specialized training. Ideally, therefore, the choice of an {{U}} {{U}} 1 {{/U}} {{/U}}should be made even before the choice of a curriculum in high school. Actually, {{U}} {{U}} 2 {{/U}} {{/U}}, most people make several job choices during their working lives, {{U}} {{U}} 3 {{/U}} {{/U}}because of economic and industrial changes and partly to improve {{U}} {{U}} 4 {{/U}} {{/U}}positions. The "one perfect job" does not exist. Young people should {{U}} {{U}} 5 {{/U}} {{/U}}enter into a broad flexible training program that will {{U}} {{U}} 6 {{/U}} {{/U}}them for a field of work rather than for a single {{U}} {{U}} 7 {{/U}} {{/U}}. Unfortunately many young people have to make career plans {{U}} {{U}} 8 {{/U}} {{/U}}benefit of help from a competent vocational counselor or psychologist. Knowing {{U}} {{U}} 9 {{/U}} {{/U}}about the occupational world, or themselves for that matter, then choose their lifework on a hit-or-miss {{U}} {{U}} 10 {{/U}} {{/U}}. Some drift from job to job. Others {{U}} {{U}} 11 {{/U}} {{/U}}to work in which they are unhappy or for which they are not fitted. One common mistake is choosing an occupation for {{U}} {{U}} 12 {{/U}} {{/U}}real or imagined prestige. Too many high-school students—or their parents for them—choose the professional field, {{U}} {{U}} 13 {{/U}} {{/U}}both the relatively small proportion of workers in the professions and the extremely high educational and personal {{U}} {{U}} 14 {{/U}} {{/U}}. The imagined or real prestige of a profession or a "white-collar" job is {{U}} {{U}} 15 {{/U}} {{/U}}. good reason for choosing it as lifework. {{U}} {{U}} 16 {{/U}} {{/U}}, these occupations are not always well paid. Since a large proportion of jobs are in mechanical and manual work, the {{U}} {{U}} 17 {{/U}} {{/U}}of young people should give serious {{U}} {{U}} 18 {{/U}} {{/U}}to these fields. Before making an occupational choice, a person should have a general idea of what he wants {{U}} {{U}} 19 {{/U}} {{/U}}life and how hard he is willing to work to get it. Some people desire social prestige, others intellectual satisfaction. Some want security, others are willing to take {{U}} {{U}} 20 {{/U}} {{/U}}for financial gain. Each occupational choice has its demands as well as its rewards.

单选题--Have you finished writing your report yet?--No, I'll finish it in ______ ten minutes. [A] another [B] other [C] more

单选题Buses ______ fewer people than trains. A. carry B. take C. bring

单选题{{B}}Text 4{{/B}} "Opinion" is a word that is used carelessly today. It is used to refer to matters of taste, belief, and judgment. This casual use would probably cause little confusion if people didn't attach too much importance to opinion. Unfortunately, most to attach great importance to it. "I have as much right to my opinion as you to yours." and "Everyone's entitled to his opinion." are common expressions. In fact, anyone who would challenge another's opinion is likely to be branded intolerant. Is that label accurate? Is it intolerant to challenge another's opinion? It depends on what definition of opinion you have in mind. For example, you may ask a friend "What do you think of the new Ford cars?" And he may reply, "In my opinion, they're ugly." In this case, it would not only be intolerant to challenge his statement, but foolish. For it's obvious that by opinion he means his personal preference, a matter of taste. And as the old saying goes, "It's pointless to argue about matters of taste." But consider this very different use of the term, a newspaper reports that the Supreme Court has delivered its opinion in a controversial case. Obviously the justices did not shale their personal preferences; their mere likes and dislikes. They stated their considered judgment, painstakingly arrived at after thorough inquiry and deliberation. Most of what is referred to as opinion falls somewhere between these two extremes. It is not an expression of taste. Nor is it careful judgment. Yet it may contain elements of both. It is a view or belief more or less casually arrived at, with or without examining the evidence. Is everyone entitled to his opinion? Of course, this is not only permitted, but guaranteed. We are free to act on our opinions only so long as, in doing so, we do not harm others.

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单选题 Questions 11 ～ 13 are based on the following talk introducing George Daniels, a watchmaker. You now have 15 seconds to read Questions 11 ～ 13.

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单选题A Hydrogen Future In the minds of some analysts, hydrogen is finally emerging as a nonpolluting, renewable form of energy that could supplant fossil fuels in the near future. Since the 1930s, environment-minded scientists, academics, energy planners, industrial executives, and even some farsighted politicians have been thinking of and supporting the concept of hydrogen as an almost ideal chemical fuel, energy carrier, and storage medium. Buckminster Fuller and other observers have described humanity's ongoing use of fossil fuels--such as energy supply, comparable to depleting a savings account. From the standpoint of long-term energy security, environmentalists are strongly advocating the option of tapping into nature's current energy account: abundant, and essentially free, solar energy. Solar energy has been a viable means of home heating, but for large-scale use, that energy must be converted into electricity. In this context, hydrogen may be prominent in future energy systems because it is capable of storing large amounts of electricity for later use. Although it is the most abundant element in the universe, hydrogen is not a primary energy source that exists in nature, as do crude oil and natural gas. Rather, it is an energy carrier ——a secondary form of energy that cannot be found freely in usable form, but has to be manufactured, like electricity. Today, most hydrogen is extracted from fossil fuels. In the future, hydrogen will be made from clean water and clean solar energy. Hydrogen can match the effectiveness of fossil fuel in powering cars, planes, and ships and in heating homes, schools, and office complexes ——without creating pollution. When burned in an internal-combustion engine, hydrogen emits a virtually harmless water-vapor exhaust. When hydrogen is burned with atmospheric oxygen in an engine, the resulting emission is clean: no unburned hydrocarbons, no carbon monoxide or carbon dioxide. Hydrogen is an essential component of fuel cells for vehicles and other applications. Fuel-cell engines can be more than twice as efficient as internal-combustion engines, argues Hoffmann. Fuel-cell engines electrochemically combine hydrogen and oxygen in a flameless process that produces heat, electricity, and distilled water. The fact that it is environmentally benign has made hydrogen energy an increasingly attractive alternative to fossil fuels as concerns about resource depletion and global warming have been growing. "The question is no longer whether we are headed toward hydrogen, but how we should get there, and how long it will take," says Worldwatch Institute research associate Seth Dunn.

单选题Which of the following is NOT affiliated to the UN? A. WHO. B. FIFA. C. UNESCO. D. IMF.

单选题In the eyes of the author, conventional opinion on conflict is ________.

单选题 Questions 17--20 are based on the following monologue about yawn. You now have 20 seconds to read Questions 17--20.

单选题We often hear the (21) "Bug" while using computers. But what is a bug? In computer science, a bug (22) an error in software or hardware. In software, a bug is an error in coding or logic that causes a program to malfunction or to (23) incorrect results. Minor bugs, for example, a cursor that does not behave as (24) -can be inconvenient or frustrating, but not damaging to (25) More severe bugs can cause a program to "hang" (stop responding to (26) and might (27) the user with no (28) but to restart the program, losing whatever (29) work had not been saved. In (30) case, the programmer must find and correct the error by the (31) known as debugging. Because of the (32) risk to important data, commercial aplication programs are tested and (33) as completely as possible before release. Minor bugs found after the program becomes (34) are corrected in the next update; more (35) bugs can sometimes be fixed with special software, called patches, that circumvents or otherwise (36) its effects. In hardware, a bug is a recurring (37) problem that prevents a system or set of (38) from working together properly. The (39) of the term reputedly goes back to the early days of computing, when a hardware problem in a computer at Harvard University was (40) to a moth caught between the contacts of a relay in the machine.