单选题下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 Sending E-mails to Professors One student skipped class and then sent the professor an e-mail {{U}}(51) {{/U}} for copies of her teaching notes. Another {{U}}(52) {{/U}} 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, {{U}}(53) {{/U}} boundaries that traditionally kept students at a healthy distance. These days, professors say, students seem to view them as available {{U}}(54) {{/U}} 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 {{U}}(55) {{/U}} you to help: 'I need to know this. '" "There's a fine {{U}}(56) {{/U}} between meeting their needs and at the same time maintaining a level of legitimacy (正统性) as an {{U}}(57) {{/U}} who is in charge. " Christopher Dede, a professor at the Harvard Graduate School of Education, said {{U}}(58) {{/U}} show that students no longer defer to (听从) their professors, perhaps because they realize that professors' {{U}}(59) {{/U}} could rapidly become outdated. "The deference was driven by the notion {{U}}(60) {{/U}} that professors were all-knowing sources of deep knowledge. " Dede said, and that notion has weakened {{U}}(61) {{/U}}. For junior faculty members, e-mails bring new tension into their work, some say, as they struggle with how to {{U}}(62) {{/U}}. Their job prospects, they realize, may rest in part on student evaluations of their accessibility. College students say e-mail makes {{U}}(63) {{/U}} easier to ask questions and helps them learn. But they seem unaware that what they write in e-mails could have negative effects on {{U}}(64) {{/U}} them, said Alexandra Lahav, and 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 {{U}}(65) {{/U}} they say in e-mail can make them seem unprofessional, and could result in a bad recommendation. "

单选题Brotherly Love Adidas and Puma have been two of the biggest names in sports shoe manufacturing for over half a century. Since 1928 they have supplied shoes for Olympic athletes, World Cup-winning football heroes, Muhammad Ali, hip hop stars and rock musicians famous all over the world. But the story of these two companies begins in one house in the town of Herzogenaurach, Germany. Adolph and Rudolph Dassler were the sons of a shoemaker. They loved sport but complained that they could never find comfortable shoes to play in. Rudolph always said, 'You cannot play sports wearing shoes that you'd walk around town with.' So they started making their own. In 1920 Adolph made the first pair of athletics shoes with spikes(钉)，produced on the Dasslers' kitchen table. On lst July 1924 they formed a shoe company, Dassler Brothers Ltd and they worked together for many years. The company became successful and it provided the shoes for Germany's athletes at the 1928 and 1932 Olympic Games. But in 1948 the brothers argued. No one knows exactly what happened, but family members have suggested that the argument was about money or women. The result was that Adolph left the company. His nickname was Adi, and using this and the first three letters of the family name, Dassler, he founded Adidas. Rudolph relocated across the River Aurach and founded his own company too. At first he wanted to call it Ruda, but eventually he called it Puma, after the wild cat. The famous Puma logo of the jumping cat has hardly changed since. After the big split of 1948 Adolph and Rudolph never spoke to each other again and their companies have now been in competition for over sixty years. Both companies were for many years the market leaders, though Adidas has always been more successful than Puma. A hip hop group, Run DMC, has even written a song called "My Adidas" and in 2005 Adidas bought Reebok, another big sports shoe company. The terrible family argument should really be forgotten, but ever since it happened, over sixty years ago, the town has been split into two. Even now, some Adidas employees and Puma employees don't talk to each other.

单选题Large Thighs" May Protect Heart" Men and women with thighs over 60cm(23.6in)in circumference have a lower risk of heart disease and early death ,a study of 3,000 people suggests. The relationship remains even when body fat, smoking and blood cholesterol are taken into account, a Danish team says. Those with narrow thighs may not have enough muscle mass to deal with insulin properly, raising the risk of diabetes and, in turn, heart disease, they say. Some said it was too early to change current advice on eating and exercise for heart health. The study ,published in the British Medical Journal, followed men and women in Denmark for more than 10 years. They were measured for height, weight and thigh, hip and waist circumference and their overall percentage of body fat was calculated. The thigh measurement was taken just below the gluteal fold, which is the crease caused by your buttocks. Researchers also looked at the activity levels of the participants, whether they smoked, their blood pressure and cholesterol levels. They then monitored incidence of heart disease over 10 years and death rates over 12 - and - a - half years. The team at the Copenhagen University Hospital found that those with the smallest thighs—be- low 55cm—had twice the risk of early death or serious health problems. Professor Befit Heitmann, who led the research, said:" The increased risk was independent of abdominal and general obesity and lifestyle and cardiovascular risk factors such as blood pressure. " "Additionally we found that the risk was more highly related to thigh circumference than to waist circumierence. " "The nice thing is that if you have a small thigh you call do something about it through exercise. " Previous studies have suggested that a waist circumference of over 35in(88.9cm) for a woman and 40in(101.6era) for a man indicated a high risk of developing diabetes and heart disease. Professor Heitmann's team says the risk of narrow thighs could be associated with too little muscle mass. They say this can lead to the body not responding to insulin properly, increasing the risk of type 2 diabetes and, in the long- run, heart disease.

单选题The attitude of the author towards the research project is

单选题Taking a Dim View of Solar Energy Despite the bad economy, or maybe because of it, the rooftop - solar industry is booming, as Americans become increasingly intrigued by the idea of turning their roofs into mini power plants and cutting their electric bills. In 2008,33,500 rooftop solar systems were installed in the United States, a 63 percent increase over the amount of capacity installed in 2007. In California, the solar capital of country, the increase was 95 percent. Meanwhile ,the outlook for the other side of the solar industry—the large, centralized power plants—isn't so sunny. These megaprojects—acres of desert covered in thousands of solar panels sending electricity—controlled mostly by utility companies that have had a monopoly over the country's electricity grid, were supposed to be the key to the future of the solar industry. So far, they're getting vastly outpaced by the decentralized rooftop approach. According to the Interstate Renewable Energy Council's 2006—2008 count, consumers added 522 megawatts to the grid; whereas utility Companies added just 96 megawatts. The disparity has utilities worried about loosing their grip on the country's energy industry, and the $130 billion residential electricity market. In some cases, utilities are actually taking direct steps to thwart rooftop solar. "There is a tension between distributed solar generation and utilities," says Adam Browning, executive director of The Vote Solar Initiative, a solar advocacy group in San Francisco. "They've had the energy pie to themselves for a century, and now facing a future where clean distributed energy will play a large part, they're looking for ways to profit from it and maintain control. People want solar panels on their roofs, so utilities should be working to make that happen rather than getting in the way. "says Browning. It's not hard to understand why a big utility might not like the idea of homes and buildings being covered in solar panels. If every building in America is generating its own solar energy, that throws a big wrench into their business model. But as most states have passed renewable - energy standards recently, mandating that a certain percentage of their energy come from renewable sources, utilities have become reluctant players in the solar game because, frankly, they have no choice. However, thanks to state and federal government subsidies, private sector can seize this opportunity to grow.

单选题The legislative provision has a great impact on the operations of the department.

单选题Glaciers {{U}}terminate{{/U}} where the rate of ice loss is equivalent to the forward advance of the glacier.

单选题The parents have to restrain their daughter from playing nearby factories.

单选题The sea was calm and still.

单选题It took me a whole hour to solve the problem. A work at B. work on C. work out D. work over

单选题Before the first Apollo rocket went to the Moon, a spot for landing the lunar module was carefully chosen.

单选题 Fitness Movement The fitness movement that began in the late 1960s and early 1970s centered around aerobic exercise. Millions of individuals became engaged in a variety of aerobic activities, and {{U}} {{U}} 1 {{/U}} {{/U}}thousands of health spas developed around the country to capitalize on his {{U}} {{U}} 2 {{/U}} {{/U}}interest in fitness, particularly aerobic dancing for females. A number of fitness spas existed {{U}} {{U}} 3 {{/U}} {{/U}}to this aerobic fitness movement, even a national chain with spas in most major cities. However, their {{U}} {{U}} 4 {{/U}} {{/U}}was not on aerobics, but rather on weight-training programs designed to develop muscular mass, {{U}} {{U}} 5 {{/U}} {{/U}}, and endurance in their primarily male {{U}} {{U}} 6 {{/U}} {{/U}}. These fitness spas did not seem to benefit {{U}} {{U}} 7 {{/U}} {{/U}}from the aerobic fitness movement to better health, since medical opinion suggested that weight-training programs {{U}} {{U}} 8 {{/U}} {{/U}}few, if any, health benefits. In recent years, however, weight training has again become increasingly {{U}} {{U}} 9 {{/U}} {{/U}}for males and for females. Many {{U}} {{U}} 10 {{/U}} {{/U}}programs focus not only on developing muscular strength and endurance but on aerobic fitness as well. {{U}} {{U}} 11 {{/U}} {{/U}}, most physical fitness tests have usually included measures of muscular strength and endurance, not for health related reasons, but primarily {{U}} {{U}} 12 {{/U}} {{/U}}such fitness components have been related to performance in athletics. {{U}} {{U}} 13 {{/U}} {{/U}}, in recent years, evidence has shown that training programs designed primarily to improve muscular strength and endurance might also offer some health {{U}} {{U}} 14 {{/U}} {{/U}}as well. The American College of Sports Medicine now {{U}} {{U}} 15 {{/U}} {{/U}}that weight training be part of a total fitness program for healthy Americans.

单选题On Sleep Baekeland and Hartmann report that the "short sleepers" had been more or less average in their sleep needs until the men were in their teens. But at about age 15 or so, the men voluntarily began cutting down their nightly sleep time because of pressures from school, work, and other activities. These men tended to view their nightly periods of unconsciousness as bothersome interruptions in their daily routines. In general, these "short sleepers" appeared ambitious, active, energetic, cheerful, conformist(不动摇) in their opinions, and very sure about their career choices. They often held several jobs at once, or workers full or part-time while going to school. And many of them had a strong urge to appear "normal" or "acceptable" to their friends and associates. When asked to recall their dreams, the "short sleepers" did poorly. More than this, they seemed to prefer not remembering. In similar fashion, their usual way of dealing with psychological problems was to deny that the problem existed, and then to keep busy in the hope that the trouble would go away. The sleep patterns of the "short sleepers" were similar to, but less extreme than, sleep patterns shown by many mental patients categorized as manic (疯人). The "long sleepers" were quite different indeed. Baekeland and Hartmann report that these young men had been lengthy sleeps since childhood. They seemed to enjoy their sleep, protected it, and were quite concerned when they were occasionally deprived of their desired 9 hours of nightly bed rest. They tended to recall their dreams much better than did the "short sleepers." Many of the "long sleepers" were shy, anxious, introverted (内向), inhibited (压抑), passive, mildly depressed, and unsure of themselves (particularly in social situations). Several openly states that sleep was an escape from their daily problems.

单选题You always follow your own {{U}}inclinations{{/U}} instead of thinking of our feelings.

单选题How does the author feel about the prospect of protecting endangered species from being extinct?

单选题 Is the Tie a Necessity? Ties, or neckties, have been a symbol of politeness and elegance in Britain for centuries. But the casual Prime Minister Tony, Blair has problems with them. Reports suggest that even the civil servants may stop wearing ties. So, are the famously formal British really going to abandon the neckties? Maybe. Last week, the UK's Cabinet Secretary Andrew Turnbull openly welcomed a tieless era. He hinted that civil servants would soon be free of the costliest 12 inches of fabric that most men ever buy in their lives. In fact, Blair showed this attitude when he had his first guests to a cocktail party. Many of them were celebrities (知名人士) without ties, which would have been unimaginable even in the recent past. For some more conservative British, the tie is a must for proper appearance. Earlier, Labor leader Jim Callaghan said he would have died rather than have his children seen in public without a tie. For people like Callaghan, the tie was a sign of being complete, of showing respect. Men were supposed to wear a tie when going to church, to work in the office, to a party - almost every social occasion. But today, people have begun to accept a casual style even for formal occasions. The origin of the tie is tricky. It started as something called simply a "band". The term could mean anything around a man's neck. It appeared in finer ways in the 1630s. Frenchmen showed a love of this particular fashion statement. Their neckwear (颈饰) impressed Charles II, the king of England who was exiled (流放) to France at that time. When he returned to England in 1660, he brought this new fashion item along with him. It wasn't, however, until the late 18th century that fancy young men introduced a more colorful, flowing piece of cloth that eventually became known as the tie. Then, clubs, military institutions and schools began to use colored and patterned ties to indicate the wearer's membership in the late 19th century. After that, the tie became a necessary item of clothing for British gentlemen. But now, even gentlemen are getting tired of ties. Anyway, the day feels a bit easier when you wake up without having to decide which tie suits you and your mood.

单选题Thanksgiving is not a truly American tradition.

单选题The towers of a suspension bridge serve as a rigid framework to which the cables are attached.

单选题An old friend called on me the day before yesterday.

单选题My brother is a {{U}}careful{{/U}} motorist (乘车者); he never does any dangerous driving.