单选题A(A noisy) B(aggressive) cousin of the crow, the magpie has C(those) bird's thievish D(habits).

单选题People who feel miserable with computers are those ______.

单选题Being out of employment, they have to Ulounge/U at street corners and wait for a chance to get a job.

单选题The geology of the Earth's surface is dominated by the particular properties of water. Present on Earth in solid, liquid, and gaseous states, water is exceptionally reactive. It dissolves, transports, and precipitates many chemical compounds and is constantly modifying the face of the Earth. Evaporated from the oceans, water vapor forms clouds, some of which are transported by wind over the continents. Condensation from the clouds provides the essential agent of continental erosion: rain. Precipitated onto the ground, the water trickles down to form brooks, streams, and rivers, constituting what is called the hydrographic network. This immense polarized network channels the water toward a single receptacle: an ocean. Gravity dominates this entire step in the cycle because water tends to minimize its potential energy by running from high altitudes toward the reference point that is sea level. The rate at which a molecule of water passes through the cycle is not random but is a measure of the relative size of the various reservoirs. If we define residence time as the average time for a water molecule to pass through one of the three reservoirs—atmosphere, continent, and ocean—we see that the times are very different. A water molecule stays, on an average, eleven days in the atmosphere, one hundred years on a continent and forty thousand years in the ocean. This last figure shows the importance of the ocean as the principal reservoir of the hydrosphere but also the rapidity of water transport on the continents. A vast chemical separation process takes places during the flow of water over the continents. Soluble ions such as calcium, sodium, potassium, and some magnesium are dissolved and transported. Insoluble ions such as aluminum, iron, and silicon stay where they are and form the thin, fertile skin of soil on which vegetation can grow. Sometimes soils are destroyed and transported mechanically during flooding. The erosion of the continents thus results from two closely linked and interdependent processes, chemical erosion and mechanical erosion. Their respective interactions and efficiency depend on different factors.

单选题The lady who has ______ for a night in the dead of the winter later turned out to be a distant relation of his.

单选题______telephone service provides immediate access to related personnel, which is free of charge.

单选题What would be the proper title for this passage?

单选题"Dimpy", as her friends call her, heard about the hazards of smoking in health class. "They showed pictures of lungs of people who smoked. It was gross," says the petite 14year-old. Yet, as she shops along the Third Street Promenade in Santa Monica, Calif. , the ninth grader points out all the places where she regularly buys cigarettes without hassle. "All my friends smoke," She shrugs, explaining the habit she developed in the sixth grade. "Once they pressure you, you start. And it's kind of hard to stop. " As the cigarette industry draws increasing fire, teen smokers like Dimpy are becoming the focus of concerned policy makers around the country. Supported by a University of Michigan study showing a dramatic rise in adolescent tobacco use, the White House is considering ways to curb the surge. Among the options: eliminating cigarette vending machines, restricting tobacco advertising, increasing the federal excise tax on cigarettes and launching a national media campaign directed at adolescents. A grand jury in New York has begun an investigation to determine whether Philip Moms Cos. concealed information linking nicotine levels and addictiveness. And the Justice Department is looking into whether tobacco company executives committed perjury in their April 1994 congressional testimony on how smoking affects health. Lack of credibility. But it's tough to get an antismoking message through to teens. The California Department of Health Service spends $12 million a year placing antismoking commercials on television, including popular MTV programs, but many teenagers aren't buying the message. Says Erica leona, who will enter eighth grade in the fall, "I don't think those ads work, because It's like a cartoon, it's too exaggerated. " In fact, teens seem skeptical about the potential effectiveness of any organized efforts to reduce smoking, like increasing taxes. While research shows that every time taxes go up, sales go down, including among teens, young people say the cost is relatively low in comparison with other vices. "You want weed, it'll cost you," says Robert Caldwell, 14. "For cigarettes, you just go anywhere, put 12 quarters into one of those machines, take it and go. " Other teens maintain that eliminating vending machines won't make cigarettes any harder to buy. "You give a guy enough to buy you a pack and a beer, and he'll buy the pack," says Cameron Davis, 13. And advertising isn't really what entices adolescents to smoke. For the most part, they say, teens smoke because of peer pressure. "It's like sex. " says 13-year-old Frances, who started smoking at age 9. "You feel like, if you don't do it with your boyfriend, he won't like you. " In addition, messages that relate to health don't compute with adolescents, who often feel invincible. It doesn't help, says Roxanne Cannon, editorial director of Teen and Sassy magazines, that so many teen idols such as Ethan Hawke, Jason Priestley and Luke Perry are seen smoking. Teens say any message is more effective if it's communicated by other kids. But even a White House appeal made by Chelsea Clinton might not get through to adolescents eager to smoke. "I don't listen to my mom when she tells me to stop," says Dimpy. "Why would I listen to anyone else. /

单选题The writer's message is that the built environment should be ______.

单选题We must try our best to lower the cost of our products. Otherwise the high cost will______our profit.

单选题{{B}}Passage Two{{/B}} Between 1833 and 1837, the publishers of a "penny press" proved that a low-priced paper, edited to interest ordinary people, could win what amounted to a mass circulation for the times and thereby attract an advertising volume that would make it independent. These were papers for the common citizen and were not tied to the interests of the business community, like the mercantile press, or dependent for financial support upon political party allegiance. It did not necessarily follow that all the penny papers would be superior in their handling of the news and opinion functions. But the door was open for some to make important journalistic advances. The first offerings of a penny paper tended to be highly sensational; human interest stories overshadowed important news, and crime and sex stories were written in full detail. But as the penny paper attracted readers from various social and economic brackets, its sensationalism was modified. The ordinary reader came to want a better product, too. A popularized style of writing and presentation of news remained, but the penny paper became a respectable publication that offered significant information and editorial leadership. Once the first of the successful penny papers had shown the way, later ventures could enter the competition at the higher level of journalistic responsibility the pioneering papers had reached. This was the pattern of American newspapers in the years following the founding of the New York Sun in 1833. The Sun, published by Benjamin Day, entered the lists against 11 other dailies. It was tiny in comparison; but it was bright and readable, and it preferred human interest features to important but dull political speech reports. It had a police reporter writing squibs of crime news in the style already proved successful by some other papers. And, most important, it sold for a penny, whereas its competitors sold for six cents. By 1837 the Sun was was more than the total of all 11 New York daily newspapers combined when the Sun first appeared. In those same four years James Gordon Bennett brought out his New York Herald (1835), and a trio of New York printers who were imitating Day's success founded the Philadelphia Public Ledger (1836) and the Baltimore Sun (1837). The four penny sheets all became famed newspapers.

单选题The government would not dare to impose taxes on such necessities as-bread or milk.

单选题In science, a theory is a reasonable explanation of observed events that are related. A theory often involves an imaginary model that helps scientists picture the way an observed event could be produced. A good example of this is found in the kinetic molecular theory, in which gases are pictured as being made up of many small particles that are in constant motion. A useful theory, in addition to explaining past observations, helps to predict events that have not as yet been observed. After a theory has been publicized, scientists design experiments to test the theory. If observations confirm the scientists' predictions, the theory is supported. If observations do not confirm the predictions, the scientists must search further. There may be a fault in the experiment, or the theory may have to be revised or rejected. Science involves imagination and creative thinking as well as collecting information and performing experiments. Facts by themselves are not science. As the mathematician Jules Henri Poincare said; " Science is built with facts just as a house is built with bricks, but a collection of facts cannot be called science any more than a pile of bricks can be called a house. " Most scientists start an investigation by finding out what other scientists have learned about a particular problem. After known facts have been gathered, the scientist comes to the part of the investigation that requires considerable imagination. Possible solutions to the problem are formulated. These possible solutions are called hypotheses. In a way, any hypothesis is a leap into the unknown. It extends the scientist's thinking beyond the known facts. The scientist plans experiments, performs calculations, and makes observations to test hypotheses. For without hypotheses, further investigation lacks purpose and direction. When hypotheses are confirmed, they are incorporated into theories.

单选题If any law and order ______ not maintained, neither the citizen nor his property is safe.

单选题How to evaluate the performance of students is still a problem that troubles many professors.(2004年电子科技大学考博试题)

单选题There was a quick turnover of staff in the department as the manager treated his employees with______contempt.(2005年中国科学院考博试题)

单选题She claims to be very learned in biochemistry, but in fact ______ she knows about it is all sadly out of date. A. so little B. that much C. what little D. how much

单选题The Untied States and Canada are lands of ______ except for the Indians, who are the only tree natives. A. emigrants B. immigrants C. dwellers D. inhabitants