单选题Sending E-mails to Professors One student skipped class and then sent the professor an e-mail (1) for copies of her teaching notes. Another (2) that she was late for a Monday class because she was recovering from drinking too much at a wild weekend party. At colleges and universities in the US, e-mail has made professors more approachable (平易近人). But many say it has made them too accessible, (3) boundaries that traditionally kept students at a healthy distance. These days, professors say, students seem to view them as available (4) the clock, sending a steady stream of informal e-mails. "The tone that they take in e-mails is pretty astounding (令人吃惊的) ," said Michael Kessler, an assistant dean at Georgetown University. "They'll (5) you to help: 'I need to know this. '" "There's a fine (6) between meeting their needs and at the same time maintaining a level of legitimacy (正统性) as an (7) who is in charge. " Christopher Dede, a professor at the Harvard Graduate School of Education, said (8) show that students no longer defer to (听众) their professors, perhaps because they realize that professors' (9) could rapidly become outdated. "The deference was driven by the (10) that professors were all-knowing sources of deep knowledge," Dede said, and that notion has (11) . For junior faculty members, e-mails bring new tension into their work, some say, as they struggle with how to (12) . Their job prospects, they realize, may rest in part on student evaluations of their accessibility. College students say e-mail makes (13) easier to ask questions and helps them learn. But they seem unaware that what they write in e-mails could have negative effects (14) them, said Alexandra Lahav, an associate professor of Law at the University of Connecticut. She recalled an e-mail message from a student saying that he planned to miss class so he could play with his son. Professor Lahav did not respond. "Such e-mails can have consequences," she said. "Students don't understand that (15) they say in e-mail can make them seem unprofessional, and could result in a bad recommendation. /

单选题Effects of Environmental Pollution If pollution continues to increase at the present rate, formation of aerosols (浮质) in the atmosphere will cause the onset (开始) of an ice age in about fifty year's time. This conclusion reached by Dr S. I. Rasoo1 and Dr S. H. Scheider of the United States Goddard Space Flight Center, answer the apparently conflicting questions of whether an increase in the carbon dioxide (二氧化碳) content of the atmosphere will cause the Earth warm up or increasing the aerosol question is dominant. Two specters haunting conservationists have been the prospect that environmental pollution might lead to the planet's becoming unbearably hot or cold. One of these ghosts has now been laid, because it seems that even an increase in the amount of carbon dioxide in the atmosphere to eight times its present value will produce an increase in temperature of only 2℃, which would take place over several thousand years. But the other problem now looms larger than ever. Aerosols are collection of small liquid or solid particles dispersed in air or some other medium. The particles are all so tiny that each is composed of only a few hundred atoms. Because of this they can float in the air for a very long time. Perhaps the most commonly experienced aerosol is industrial smog (烟雾) of the kind that plagued London in the 1950s and is an even greater problem in Los Angeles today. These collections of aerosols reflect the Sun's heat and thereby cause the Earth to cool. Dr Rasoo1 and Dr Schneider have calculated the exact effect of a dust aerosol layer just above the Earth's surface in the temperature of the planet. As the layer builds up, the present delicate balance between the amount of heat absorbed from the Sun and the amount radiated from the Earth is disturbed. The aerosol layer not only reflects much of the Sun's light but also transmits the infrared (红外线) radiation from below. So, while the heat input to surface drops, the loss of heat remains high until the planet cools to a new balanced state. Within fifty years, if no steps are taken to stop the spread of aerosols in the atmosphere, a cooling of the Earth by as much as 3.5~C seems inevitable. If that lasts for only a few years it would start another ice age, and because the growing ice caps at each pole would themselves reflect much of the Sun's radiation it would probably continue to develop even if the aerosol layer were destroyed. The only bright spot in this gloomy forecast lies in the hope expressed by Dr Rasoo1 and Dr Schneider that nuclear powder may replace fossil fuels in time to prevent the aerosol content of atmosphere from becoming critical.

单选题The offender will be sentenced to life imprisonment.

单选题He {{U}}replied{{/U}} that this was absolutely impossible.

单选题Some species of bacteria and fungi thrive on simple compounds such as alcohol.

单选题The curious looks from the strangers around her made her feel {{U}}uneasy{{/U}}.

单选题They have the (capability) to destroy the enemy in a fewdays.

单选题The indecisive man was readily persuaded to change his mind again.

单选题We should give our guests some art crafts authentically Chinese so that they could better understand Chinese culture.______

单选题This is not typical of English,but is a feature of the Chinese language.

单选题It takes about an hour to get there, allowing for possible traffic delays.A. attendingB. taking account ofC. in the charge ofD. taking charge of

单选题We will abide by their decision.______

单选题Our company is collaborating with a Japanese firm in designing a new computer.A. mergingB. allocatingC. communicatingD. cooperating

单选题Wolfgang Kundt,who has developed an alternative theory

单选题The earliest kind of desk was a box that had a {{U}}sloping{{/U}} lid, under which there was storage space for writing materials.

单选题The French and Indian War of 1756-1763 pitted Britain, her American colonists, and her Indian allies against France, her Canadian colonists, and her Indian allies.

单选题I had some difficulty in carrying out the plan.

单选题Making a Loss is the Height of Fashion Given that a good year in the haute couture (高级定制女装) business is one where you lose even more money than usual, the prevailing mood in Paris last week was sensational. The big-name designers were falling over themselves to boast of how many outfits they had sold at below cost price, and how this proved that the fashion business was healthier than ever. Jean-Paul Gaultier reported record sales, "but we don"t make any money out of it," the designer assured journalists backstage. "No matter how successful you are, you can"t make a profit from couture," explained Jean-Jacques Picart, a veteran fashion PR man, and co-founder of the now-bankrupt Lacroix house. Almost 20 years have passed since the unusual economics of the couture business were first exposed. Outraged that he was losing money on evening dresses costing tens of thousands of pounds, the couturier Jean-Louis Scherrer published a detailed summary of his costs. One outfit he described curtained over half a mile of gold thread, 18,000 sequins (亮片), and had required hundreds of hours of hand-stitching in an atelier (制作室). A fair price would have been ￡50,000, but the couturier could only get ￡35,000 for it. Rather than riding high on the follies of the super-rich, he and his team could barely feed their hungry families. The result was an outcry and the first of a series of government—and industry—sponsored inquiries into the surreal (超现实的) world of ultimate fashion. The trade continues to insist that couture offers you more than you pay for, but it"s not as simple as that. When such a temple of old wealth starts talking about value for money, it isn"t to convice anyone that dresses coating as much as houses are bargain. Rather, it is to preserve the peculiar mystique (神秘), lucrative (利润丰厚的) associations and threatened interests that couture represents. Essentially, the arguments couldn"t be simpler. On one side are those who say that the business will die if it doesn"t change. On the other are those who say it will die if it is highly dated. Huge in its costs, tiny in its clientele and questionable in its influence, it still remains one of the great themes of Parisian life. In his book, The Fashion Conspiracy, Nicholas Coleridge estimates that the entire couture industry rests on the whims (一时兴起) of less than 30 immensely wealthy women, and although the number may have grown in recent years with the new prosperity of Asia, the number of couture customers worldwide is no more than 4,000. To qualify as couture, a garment must be entirely handmade by one of the 11 Paris couture houses registered to the Chambre Syndicale de la Haute Couture. Each house must employ at least 20 people, and show a minimum of 75 new designs a year. So far, so traditional, but the Big Four operators—Chanel, Dior, Givenchy and Gaultier—increasingly use couture as a marketing device for their far more profitable ready-to-wear, fragrance and accessory lines.

单选题The factory is due to be pulled down next year.