单选题Global warming may or may not be the great environmental crisis of the 21st century, but— regardless of whether it is or isn't — we won't do much about it. We will argue over it and may even, as a nation, make some fairly solemn-sounding commitments to avoid it. But the more dramatic and meaningful these commitments seem, the less likely they are to be observed. A1 Gore calls global warming an "inconvenient truth," as if merely recognizing it could put us on a path to a solution. But the real truth is that we don't know enough to relieve global warming, and — without major technological breakthroughs — we can't do much about it. From 2003 to 2050, the world's population is projected to grow from 6.4 billion to 9.1 billion, a 42% increase. If energy use per person and technology remain the same, total energy use and greenhouse gas emissions(mainly, CO2) will be 42% higher in 2050. But that's too low, because societies that grow richer use more energy. We need economic growth unless we condemn the world's poor to their present poverty and freeze everyone else's living standards. With modest growth, energy use and greenhouse emissions more than double by 2050. No government will adopt rigid restrictions on economic growth and personal freedom (limits on electricity usage, driving and travel) that might cut back global warming. Still, politicians want to show they're "doing something." Consider the Kyoto Protoco(京都议定书). It allowed countries that joined to punish those that didn't. But it hasn't reduced CO2 emissions(up about 25% since 1990), and many signatories(签字国) didn't adopt tough enough policies to hit their 2008—2012 targets. The practical conclusion is that if global warming is a potential disaster, the only solution is new technology. Only an aggressive research and development program might find ways of breaking our dependence on fossil fuels or dealing with it. The trouble with the global warming debate is that it has become a moral problem when it's really an engineering one. The inconvenient truth is that if we don't solve the engineering problem, we're helpless.

单选题______ wealthy does not necessarily mean that a man is greedy. A. For the reason that he is B. The reason of being C. Just because he is D. That he is

单选题The new currency will get into ______ soon.

单选题Which of the following is not TRUE of the investigation?

单选题 I have an infatuation (迷恋) with autumn. The colors of the season, and the smells, havealways thrilled me. I have always found joy in this time of year. The last few autumns of my life,however, I recollect in shades of gray rather than cheerful oranges and yellows. When I became a single mother, every aspect of life took on new meaning. Since I was usedto carrying out most of the parental duties without much help during my marriage, I truly did notforesee how different parenting would become after the marriage was over. But suddenly I realized Iwas a statistic. The daily routine was not changed so much; it was the angle at which I had begunto look at life. I believed my ex-husband's lawyer was tracking every grade the children made, and I wasunder a microscope in this new town where the children and I moved our "broken home." Ifeared having to eventually establish my family with each new teacher and each new term as asingle-parent family. I just wanted to be us again, without the stigma (特征) of the label thatput on us. During those few gray years, I would reassure myself that soon things would be better, andthat I would someday be able to feel whole again. There is no mathematical equation of adultsproportioned to children to equal a stable, loving family. Every family has its strengths. In fact,studies show that in families who read together, eat together and communicate openly, childrenare likely to succeed academically, as well as socially and emotionally. I am sure these habits arejust as effective when practiced in single-parent families. I realize now that I am not a statistic. Weare an active, vital family in this charming community, where we are not marked by any stigma ofany statistics of any focus groups. We are given opportunity, all of us. We are surrounded by beauty and immersed inpossibility. There is joy to be found here, in what we see around us and in creating our ownrendition of how we want to be seen. There is strength and grace in our own willingness to breakfree from conformity without falling behind the barriers of self--imposed limitations or preconceivednotions of where we should fit in this world according to research.

单选题It's no use ______ with him. You might as well argue with a stone wall. A. arguing B. of arguing C. in arguing D. to argue

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单选题Once the 12 Girls Band became popular, similar groups predictably starting popping up. Musicat and Beautiful Youth 18 were formed last year. Both feature now-familiar formulas of attractive young women playing different instruments in songs that combine modem music with classic Chinese tunes. Yet they add to the mix by throwing in song, dance and even acrobatics. In an interview, noted music critic Jin Zhaojun said the gift band phenomenon was not new to China, as similar acts appeared in the 1980s. However, the undying rule is that to be successful, bands have to have a novel look. "The 12 Girls Band was the first group to give big live shows and showy creativity in how they present their performances. The Beijing Red Poppy Ladies Percussion group, formed in 1999, has made a name for itself because they are the only band that exclusively plays drams and percussion instruments. Bands that don't have 'a thing' are sure to die fast," Jin said.

单选题If you have www. chinadaily. com. cn /cn/bdu, you can get in touch with BDU by______.

单选题It remains to be seen whether the reserves of raw materials in the year 2000 will be sufficient to supply a world economy which will have grown by five hundred percent. Southeast Asia alone will have an energy consumption five times greater than that of Western Europe in 1970. Incidentally, if the underdeveloped countries started using up petrol at the same rate as the industrialized areas, then world reserves would be exhausted by 1990. All this only goes to show just how important it is to set up a plan to conserve and divide up fairly natural resources on a worldwide scale. This is a matter of life and death because world population is expanding at an incredible rate. By the middle of the next century population will expand every year by as much as it did in the first 1,500 years after Christ. In the southern, poor parts of the globe, the figures are enough to make your hair stand on end. Even supposing that steps are taken to stabilize world population in the next fifty years, the number of inhabitants per square kilometer will increase by from 4 in the United States to 140 in South East Asia. What can we do about it? In the first hypothesis we do nothing. By the year 2000, the southern parts of the world would then have a population greater than the total world population today. Alternately we could start acting right now to bring birth rate under control within fifteen years so that population levels off. Even then the population in the southern areas would not stop growing for seventy-five years. And the population would level off at something like twice today's figure. Finally, we could wait ten to twenty years before taking action. If we wait ten years the population of the southern area would stabilize at 3,000 million. Even today the number of potential workers increases by 350,000 people per week. By the end of the century this figure will reach 750,000; in other words, it will be necessary to find work for 40 million people per year--not to speak of food. What this means in practical terms we can scarcely imagine. But clearly if we do nothing, nature will solve the problem for us. But at what cost!

单选题Customer: ______if you'd serve me as quickly as possible as I've got an appointment at two fifteen.Waiter: I'll do my best, Madam.

单选题Bill Gates, the billionaire Microsoft chairman without a single earned university degree, is by his success raising new doubts about the worth of the business world"s favorite academic title: the MBA (Master of Business Administration). The MBA, a 20th-century product, always has borne the mark of lowly commerce and greed (贪婪) on the tree-lined campuses ruled by purer disciplines such as philosophy and literature. But even with the recession apparently cutting into the hiring of business school graduates, about 79, 000 people are expected to receive MBAs in 1993. This is nearly 16 times the number of business graduates in 1960, a testimony to the widespread assumption that the MBA is vital for young men and women who want to run companies some day. "If you are going into the corporate world it is still a disadvantage not to have one,"said Donald Morrison, professor of marketing and management science. "But in the last five years or so, when someone says, "Should I attempt to get an MBA", the answer a lot more is: It depends. " The success of Bill Gates and other non-MBAs, such as the late Sam Walton of Wal-Mart Stores Inc., has helped inspire self-conscious debates on business school campuses over the worth of a business degree and whether management skills can be taught. The Harvard Business Review printed a lively, fictional exchange of letters to dramatize complaints about business degree holders. The article called MBA hires "extremely disappointing" and said "MBAs want to move up too fast, they don"t understand politics and people, and they aren"t able to function as part of a team until their third year. But by then, they"re out looking for other jobs. " The problem, most participants in the debate acknowledge, is that the MBA has acquired an aura (光环) of future riches and power far beyond its actual importance and usefulness. Enrollment in business schools exploded in the 1970s and 1980s and created the assumption that no one who pursued a business career could do without one. The growth was fueled by a backlash (反冲) against the anti-business values of the 1960s and by the women"s movement. Business people who have hired or worked with MBAs say those with the degrees often know how to analyze systems but are not so skillful at motivating people. "They don"t get a lot of grounding in the people side of the business," said James Shaffer, vice-president and principal of the Towers Perrin management consulting firm. (419 words)

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单选题It wasn’t such a desirable air conditioner ______ the advertisement had promised us.

单选题James: Can I borrow your notes for today's geology class?Jane: ______

单选题He ______with Smith at least four times in the past three years.

单选题 When I was still an architecture student, a teacher told me, "we learn more from buildingsthat fall down than from buildings that stand up." What he meant was that construction is as muchthe result of experience as of theory. Although structural design follows established formulas, theactual performance of a building is complicated by the passage of time, the behavior of users, thenatural element s--and unnatural events. All are difficult to simulate. Buildings, unlike cars,can' t be crash-tasted. The first important lesson of the World Trade Center collapse is that tall buildings canwithstand the impact of a large jetliner. The twin towers were supported by 59 perimeter columnson each side. Although about 30 of these columns, extending from four to six floors, weredestroyed in each building by the impact, initially both towers remained standing. Even so, thedeath toll (代价) was appalling--2235 people lost their lives. I was once asked, how tall buildings should be designed given what we'd learned from theWorld Trade Center collapse. My answer was, "lower". The question of when a tall buildingbecomes unsafe is easy to answer. Common aerial fire-fighting ladders in use today are 100 feethigh and can reach to about the 10th floor, so fires in buildings up to 10 stories high can be foughtfrom the exterior (外部) . Fighting fires and evacuating occupants above that height depend onfire stairs. The taller the building, the longer it will take for firefighters to climb to the scene of thefire. So the simple answer to the safety question is"lower than 10 stories." Then why don't cities impose lower height limits? A 60-story office building does not havesix times as much rentable space as a 10-story building. However, all things being equal, such abuilding will produce four times more revenue and four times more in property taxes. So cuttingbuilding heights would mean cutting city budgets. The most important lesson of the World Trade Center collapse is not that we should stopbuilding tall buildings but that we have misjudged their cost. We did the same thing when weunderestimated the cost of hurtling along a highway in a steel box at 70 miles per hour. It took manyyears before seat belts, air bags, radial tires, and antilock brakes became commonplace. Atfirst, cars simply were too slow to warrant concern. Later, manufacturers resisted these expensivedevices, arguing that consumers would not pay for safety. Now we do willingly.

单选题I got a headache. Otherwise I ______ to the lecture. A. would go B. would have gone C. went D. have

单选题A: It seems to be clearing up. B: ______ A. It's such a nice change. B. I don't think this weather will last. C. I hope it stays warm. D. As long as it rains.