单选题Man: Hey, Mary. I was invited to be a judge for the Miss America Beauty Contest. Woman: Oh, really? Come on, you're pulling my leg. Question: what does the woman mean?

单选题Most lecturers find it expedient to use notes when addressing to graduate students.

单选题The landscape can change abruptly after a rainstorm in the desert in Xinjiang.

单选题If a child starts to speak later than others, he will ______.

单选题This rule cannot be ______ to every case.

单选题Man: Our budget is a little tight this year. As we plan our vacation, let's keep that in mind. Woman: There are a lot of very interesting things to see that are close to home. Maybe we could consider some things like backpacking in the mountains.Question: Why does the woman suggest a backpacking in the mountains?

单选题A: Have you heard that all flights have been cancelled because of the weather? B: ______.

单选题Because of adverse weather conditions, the travelers stopped to camp.

单选题To get from Kathmandu to the tiny village in Nepal, Dave Irvine-Haltiday spent more than two days. When he arrived, he found villagers working and reading around battery powered lamps equipped with light-emitting diodes, or LEDs—the same lamps he had left there in 2000. Irvine-Halliday, an American photonics engineer, was not surprised. He chose to use LED bulbs because they are rugged, portable, long-lived, and extremely efficient. Each of his lamps produces a useful amount of illumination from just one watt of power. Villagers use them about four hours each night, then top off the battery by pedaling a generator for half an hour. The cool, steady beam is a huge improvement over lamps still common in developing countries. In fact, LEDs have big advantages over familiar incandescent (白炽的) lights as well--so much so that Irvine-Halliday expects LEDs will eventually take over from Thomas Edison's old light bulb as the world's main source of artificial illumination. The dawn of LEDs began about 40 years ago, but early LEDs produced red or green glows suitable mainly for displays in digital clocks and calculators. A decade ago, engineers invented a semiconductor crystal made of an aluminum compound that produced a much brighter red light. Around the same time, a Japanese engineer developed the first practical blue LED. This small advance had a huge impact because blue, green, and red LEDs can be combined to create most of the colors of the rainbow, just as that in a color television picture. These days, high-intensity color LEDs are showing up everywhere such as the traffic lights. The reasons for the rapid switchover are simple. Incandescent bulbs have to be replaced annually, but LED traffic lights should last five to ten years. LEDs also use 80 to 90 percent less electricity than the conventional signals they replace. Collectively, the new traffic lights save at least 400 million kilowatt-hours a year in the United States. Much bigger savings await if LEDs can supplant Mr. Edison's bulb at the office and in the living room. Creating a white-light LED that is energy-saving, cheap and appealing has proved a tough engineering challenge. But all the major lightbulb makers—including General Electric, Philips, and Osram-Sylvania--are teaming up with semiconductor manufacturers to make it happen.

单选题The purpose of writing this passage is to .

单选题According to Gary Dickstein, today’s “helicopter parents”_____

单选题{{B}}Passage Two{{/B}} He has been at the helm (舵)of the Securities and Exchange Commission for only three months, but William Donaldson has given individual investors reason to believe that he will prove to be an effective champion of their interests as a vigilant regulator of the nation's financial markets. The challenges ahead remain daunting, but Mr. Donaldson is steadily restoring the agency's credibility in the wake of its disastrous stewardship by Harvey Pitt. The SEC. chairman passed his first big test by persuading William McDonough, the respected president of the New York Federal Reserve, to run the new accounting oversight board created by Congress last summer. He has also opened an important inquiry into trading practices at the New York Stock Exchange. The commission has issued rules to tighten corporate boards' oversight over financial audits. Mr. Donaldson should now see that more is done to shore up shareholder democracy. A reassuring sign that there is a new sheriff(治安官)on Wall Street came in the aftermath of the recently announced landmark settlement with 10 brokerage(经纪人业务)firms over their tainted stock research. The SEC. chairman sternly rebuked Philip Purcell, the chief executive of Morgan Stanley, for trying to minimize the extent of his firm's involvement in the scandals. Mr. Donaldson, a former Wall Street banker himself, wrote a letter to Mr. Purcell describing concern over his "troubling lack of contrition" , and reminding him that Morgan could face further legal problems if it denied the settled charges. Besides being unusual, Mr. Donaldson's move was a powerful use of his office's bully pulpit (讲坛). With all the talk about whether the SEC. has enough material resources to pursue corporate malfeasance—the agency's budget is being increased significantly—it was easy in the Harvey Pitt era to forget that a strong SEC chairman can wield a great deal of moral authority. This is especially true given financial institutions absolute need to retain public trust. Mr. Donaldson should be ready to use his bully pulpit often. Wall Street is awash in a "troubling lack of contrition" for its past misdeeds.

单选题Voters fear that the candidate's Uprovincial/U outlook and inexperience might be in his way.

单选题Man: You must have been overwhelmed with the noise at the party. Woman: Worse than that. We have a new painting hanging over the fireplace, and one boy sprit his juice all over the rug when he was walking over the fireplace to look at the picture. Question: What happened at the party?

单选题Assuming that a constant travel-time budget, geographic constraints and short-term infrastructure constraints persist as fundamental features of global mobility, what longterm results can one expect? In high-income regions, (61) North America, our picture suggests that the share of traffic (62) supplied by buses and automobiles will decline as high-speed transport rises sharply. In developing countries, we (63) the strongest increase to be in the shares first for buses and later for automobiles. Globally, these (64) in bus and automobile transport are partially offsetting. In all regions, the share of lowspeed mil transport will probably continue its strongly (65) decline. We expect that throughout the period 1990—2050, the (66) North American will continue to devote most of his or her 1.1-hour travel-time (67) to automobile travel. The very large demand (68) air travel (or high-speed mil travel) that will be manifest in 2050 (69) to only 12 minutes per person a day; a little time goes a long way in the air. In several developing regions, most travel (70) in 2050 will still be devoted to no motorized modes. Buses will persist (71) the primary form of motorized transportation in developing countries for decades. (72) important air travel becomes, buses, automobiles and (73) low-speed trains will surely go on serving vital functions. (74) of the super-rich already commute and shop in aircraft, but average people will continue to spend most c their travel time on the (75) .

单选题If those "mad moments"— when you can't recall what your friend has told you or where you left your keys—are becoming more frequent, mental exercises and a healthy brain diet may help. Just as bodies require more maintenance with the passing years, so do brains, which scientists now know show signs of aging as early as the 20s and 30s. "Brain aging starts at a very young age, younger than any of us have imagined and these processes continue gradually over the years," said Dr. Gary Small, the director of the Center on Aging at the University of California, Los Angeles. "I'm convinced that it is never too early to get started on a mental or brain-fitness program," he added. In his book, "The Memory Bible," the 51-year-old neuroscientist lists what he refers to as the 10 commandments for keeping the brain young. They include training memory, building skills, minimizing stress, mental exercises, brain food and a healthy lifestyle. It's a game plan for keeping brain cells sparking and neural networks in tip-top shape. "Misplacing your keys a couple of times doesn't mean you should start labeling your cabinets. Memory loss is not an inevitable consequence of aging. Our brains can fight back," he said. Small provides the weapons for a full-scale attack. According to him, simple memory tests give an indication of what you are up against and tools such as look, snap and connect are designed to make sure that important things such as names and dates are never forgotten. "So if you want to learn names and faces, for example, you meet Mrs. Beatty and you notice a distinguishing facial feature, maybe a prominent eyebrow," said Small. "You associate the first thing that comes to mind. I think of the actor Warren Beatty so I create a mental snapshot of Warren Beatty kissing her brow. " Small admits it may sound a bit strange but he says it works. " Mental exercises could be anything from doing crossword puzzles and writing with your left hand if you are right handed or learning a language. It could be anything that is fun that people enjoy doing", he added. He also recommends physical exercise, a low-fat diet and eating foods rich in omega-3 fatty acids, such as fish, walnuts and Brazil nuts, and fruits and vegetables high in antioxidants (抗氧化剂) including blueberries and onions in addition to reducing stress.

单选题A: Excuse me. I don' t want to interrupt you...B: ______

单选题She could not restrain her curiosity to see what was in the box before her guests had left.

单选题American culture has not been immune to cultural influences from outside. The idea of democracy came from the ancient Greeks: the Industrial Revolution started in England: jazz and rock music preserve African rhythms--to pick a few examples. Indeed, many of the things we think of as "100 percent American" came from other cultures. Still, most of the changes in American culture over the last century have come from within, as the result of inventions and discoveries. And change has been dramatic. One hundred years ago the United States was largely a nation of farmers. Many of the things we take for granted today- a high school education, for example, or indoor plumbing—were luxuries then. The moon was a light for lovers, not a site for scientific exploration; genetic engineering (基因工程) was not even a subject for science fiction, much less for laboratory research and corporate investments. The decades following the Second World War, in particular, were characterized by spectacular scientific and technological advances, national self-confidence, optimism, and (for many Americans) prosperity. The American economy was the strongest in the world: more goods were produced and sold, more people were working, and the standard of living was higher than ever before. Polls (民意调查) taken in the 1950s and 1960s show that the average American was preoccupied with the questions "will I make a good living? "Will I be successful?" and "Will I raise successful, happy children?" Success was defined in terms of maintaining a stable family and "keeping up with the Jones". Most Americans believed that if they played by the rules--if they work hard and did what was expected, if they sacrificed their own needs to those of their family and their employer--they would be rewarded with an ever-increasing standard of living, a devoted spouse, and decent children. An expensive car, a suburban home, and children in college were tangible (可触知的) signs that hard work and self-sacrifice paid off.