单选题A. punishB. businessC. runningD. brush

单选题A: It"s already 9 o"clock. I"m afraid I have to go. Thank you for the wonderful dinner. B: ______

单选题It is hard to track the blue whale, the ocean"s largest creature, which has almost been killed off by commercial whaling and is now listed as an endangered species. Attaching radio devices to it is difficult, and visual sightings are too unreliable to give real insight into its behavior. So biologists were delighted early this year when, with the help of the Navy, they were able to track a particular blue whale for 43 days, monitoring its sounds. This was possible because of the Navy"s formerly top-secret system of underwater listening devices spanning the oceans. Tracking whales is but one example of an exciting new world just opening to civilian scientists after the cold war as the Navy starts to share and partly uncover its global network of underwater listening system built over the decades to track the ships of potential enemies. Earth scientists announced at a news conference recently that they had used the system for closely monitoring a deep-sea volcanic eruption (爆发) for the first time and that they plan similar studies. Other scientists have proposed to use the network for tracking ocean currents and measuring changes in ocean and global temperatures. The speed of sound in water is roughly one mile a second—slower than through land but faster than through air. What is most important, different layers of ocean water can act as channels for sounds, focusing them in the same way a stethoscope (听诊器) does when it carries faint noises from a patient"s chest to a doctor"s ear. This focusing is the main reason that even relatively weak sounds in the ocean, especially low-frequency ones, can often travel thousands of miles. (283 words)

单选题What point is the author making by stating that farmers could carry nearly all their tools on their backs? ( )

单选题According to recent U. S. Statistics Yearbook, Americans spend $16 billion a year on credit cards and there are already 590 million in ______. A. preparation B. communication C. administration D. circulation

单选题Man: Can I borrow your maths textbook? I lost mine on the bus. Woman: You've asked the right person. I happen to have an extra copy. Question: What does the woman mean?

单选题The less the surface of the ground yields to the weight of the body of a runner, ______to the body.

单选题In the Arizona desert, tomatoes hang from ceilings, spinach grows without soil and shrimp lire in indoor pools. What's going on.'? Food research! People perform these experiments to learn how to produce more food. There will be over 6.5 bil- lion people on earth after two decades. We will have to produce four times as much food as we do now to feed all these people. But each year there is less fresh water, the soil loses nutrients and buildings take up more land. We must learn to use resources we have always thought unusable. So, the Environ- mental Research Laboratory in Arizona tries to grow food without soil, in the desert, and with salt water. So far the results have been excellent. The new methods yield twenty times more tomatoes and cu-cumbers than can be grown on a farm. About sixty times as many shrimp can be raised in indoors pools than ten boats can catch in the ocean in a year. Crops can grow in salty soil. Plus, as they grow, they take salt and minerals from desert soil, to create more useable land. The University of Arizona runs the research center in Arizona. But there are centers all over the world. Because of the promising results, big companies pay for some of the research. With interest and money backing them, researchers can go far. Their aim is to use wasted land and water to feed humanity. In the Arizona desert, they are off to a great start.

单选题Life really should be one long journey of joy for children who are born with a world of wealth at their tiny feet. But experts on psychological research now believe that silver spoons can leave a bitter taste. If suicide statistics are a sign of happiness, then the rich are a miserable lot. Figures show that it is the rich who most often do away with themselves. Dr. Robert Coles, an internationally famous doctor, is the world"s top expert on the influence of money on children. He has written a well-received book on the subject, The Privileged Ones , and his research shows that too much money in the family can cause as many problems as too little. "Obviously there are certain advantages to being rich," says the 53-year-old doctor, "such as better health, education and future work expectation, but most important is the quality of family life. Money can"t buy love." It can buy a lot of other things, though, and that"s where the trouble starts. Rich kids have so much to choose from that they often become confused. Their parents" over favoring can make them spoiled. They tend to travel more than other children, from home to home and country to country, which often makes them feel restless. "But privileged children do have a better sense of their positions in the world," adds Mr. Coles, "and they are more self-assured." Today"s rich parents perhaps have realized that their riches can be more of a burden than a favor to their children. So their priority is to ensure that their families are as rich in love as they are in money.

单选题{{B}}Passage Five{{/B}} There is no question that the old style of air pollution could kill people. In one week following the infamous "peasouper" fog in December 1952,4,700 people died in London. Most of these people were elderly and already had heart or lung diseases. A series of these killer fogs eventually led to the British Parliament passing the Clean Air Act which restricted the burning of coal. Fortunately the effect of smog on the lungs is not so dramatic. Scientists have now conducted a number of laboratory experiments in which volunteers are exposed to ozone inside a steel chamber for a few hours. Even at quite low concentrations there is a reversible fall in lung function, an increase in the irritability of the lungs and evidence of airway inflammation. Although irritable and inflamed lungs are particularly seen in people with asthma (哮喘) and other lung diseases, these effects of ozone also occur in healthy subjects. Similar changes are also seen after exposure to nitrogen dioxide, although there is some disagreement about the concentration at which they occur. Other studies have found that people living in areas with high levels of pollution have more symptoms and worse lung function than those living in areas with clean air. Groups of children attending school camps show falls in lung function even at quite low concentrations of ozone. There is also a relationship between ozone levels and hospital admissions for asthma, both in North America and Australia. It is suspected that long-term exposure to smog may result in chronic bronchitis (支气管炎) and emphysema (肺气肿), but this has yet to be proven. Recently an association has been found between the levels of particles in the air and death rates in North American cities. The reason for this association is not understood and as yet there is no evidence this occurs in Australia. However, we do know that hazy days are associated with more asthma attacks in children.

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单选题By the time Bob arrives in Beijing______.

单选题Which of the following is not written by Christopher Marlowe?

单选题Scientists have for the first time used cloning to create human embryos that live long enough in a laboratory dish to have their stem cells harvested. The feat could set the stage for physicians to produce cells and tissues, tailored to a patient's genetic identity that can treat a wide variety of human illnesses. The accomplishment also provides a road map for how to clone a person, an even more divisive undertaking. The new work, performed in South Korea, represents "a major advance in stem cell research. It could help spur a medical revolution as important as antibiotics and vaccines", says Robert Lanza of Advanced Cell Technology (ACT), a company in Worcester, Mass., that's also investigating the promising stem cell strategy called therapeutic cloning. "However, now that the methodology is publicly available", Lanza adds, "I think it is absolutely imperative that we pass laws worldwide to prevent the technology from being abused for reproductive-cloning purposes." While some fertility doctors and a religious cult have claimed success at creating a pregnancy via cloning, they've offered no convincing proof. In contrast, the South Korean research is being reported at the meeting of the American Association for the Advancement of Science in Seattle and will appear in an upcoming Science. "This is reality," says stem cell researcher John Gearhart of Johns Hopkins University. "He4'e is a bona fide, refereed journal saying that a human embryo has been cloned and a cell line derived from it." Although ACT has not yet published a report of a cloned human blastocyst, Lanza says that the South Korean success is "consistent with our own results." Therapeutic cloning appeals to Lanza and physicians because cells made this way could have the same DNA as a patient's cells do and thus avoid rejection after they're transplanted. Seeking a compromise that would permit this strategy to be pursued, many scientists have called for legislation that would ban cloning to produce a baby but allow the creation of cloned embryos to generate stem cells for research or therapies. "The debate has been very polarized," notes bio-ethicist Laurie Zoloth of Northwestern University in Evanston.

单选题A: May I play my computer game for an hour? B: ______

单选题Chicago began life in 1779 (1) a small trading post on the Chicago River. A farsighted black freedman, Jean du Sable, did a flourishing fur (2) with the Native Americans. When his trading post became a fort and then a city, it was (3) Chicago. This is the Native American word for the wild onions found in the area. In 1820 Chicago (4) ten or twelve houses and a store or two. Now it is the third largest city in the (5) , and still it continues to grow. Thousands of new buildings are (6) every year. They are built to accommodate new businesses and residences. More than seven (7) people now live in and around the city. Astride the crossroads of the nation, Chicago is the largest railroad (8) in the world. No other city in the land is a larger trucking center. The city, (9) on lake Michigan, is the largest inland port in the world. O'Hare Airport is the world's busiest commercial airport. Overall, Chicago is the leading (10) center in the United States. Its location in the heart of North America's farmland (11) Chicago the world's largest grain market. It also plays (12) each year to more than a thousand conventions. In 1860 Abraham Lincoln was nominated for President at the Republican convention (13) here. That was to establish a pattern for both the Democratic and Republican parties since that time. Half of all major (14) conventions have taken place in Chicago. But Chicago did not achieve success without problems. At one time pollution from the Chicago River (15) the city's water supply from Lake Michigan. (16) pure drinking water, the engineers reversed the course of the river (17) it flowed backwards, away from the lake! This kept the water supply (18) . Even the famous fire of 1871 could not snuff out the spirits of the vital young giant. The entire central city was (19) , but citizens built anew. And they erected the first towering structure of steel and concrete. In doing so, they invented the (20) Today, as an example, Chicago's impressive skyline includes the world's tallest building. The 1454 foot Sears Tower.

单选题Nowhere else in the world ______ more beautiful scenery than in Switzerland.

单选题Because a degree from a good university is the means to a better job, education is one of the most ______ areas in Japanese life. A. sophisticated B. competitive C. considerate D. superficial