单选题It can be regarded as the worst day in my entire life.

单选题Although originally a German innovation, kindergarten got its real start in the United States as a movement to provide an improved learning environment for children.

单选题I don't quite {{U}}follow{{/U}} what she is saying A. believe B. understand C. explain D. accept

单选题You should have Ublended/U the butter with the sugar thoroughly.

单选题Why do you want to {{U}}throw away{{/U}} those books?

单选题The heat released by burning oil and coal is the direct cause of global warming.

单选题I wonder who first Uconceived/U the idea of cutting a hole in the door.

单选题It took US. a long time to {{U}}mend{{/U}} the house. A. build B. destroy C. design D. repair

单选题We tried to {{U}}restrict{{/U}} our conversation to arguments relevant to the topic.

单选题{{B}}第二篇{{/B}} {{B}}The Net Cost of Making a Name for Yourself{{/B}} Companies are paying up to $10,000 to register a domain name on the Internet even though there is no guarantee that they will get the name they want. The task of registering domains ending in. com, org, .edu and. net is at present contracted out by the US government to the Virginia-based company Network Solutions. The contract runs out this year, and the government wants to bring in a different scheme. But last year, an ad hoc committee of the Internet's great and good revealed its own plan. This involved setting up seven new domains, each indicating the kind of business or organisation using that name. The committee recruited 88 companies around the world to act as registrars for its firm, . shop, . web, . arts, . rec, . info and. nom domains. The US government has still to give the system its blessing, and may yet push ahead with its original scheme. Despite this, the 88 registrars have been taking applications for several months. They are due to start registering names this month with the Internet Council of Registrars, which grew out of the ad hoc committee. To prevent conflicting names from being registered, the council will take one name from each registrar in mm before going back for the second name in their queues, and so on. This has led to a flourishing trade, with companies trying to buy a place near the head of the queue. Global Names of Singapore is charging $10,000 to make sure a request for a name is the first one it sends off to the central database. Other registrars are charging nonrefundable deposits for places at the top of the queue. David Maher, chairman of the Policy Oversight Committee that is helping to set up and oversee the system, says that all registrars are subject to local laws regarding consumer protection and competition. But he says that the committee "will not act as an enforcement body in this area."

单选题The FBI Uselected/U out possible traitors out of the organization.

单选题Experts Call for Local and Regional Control of Sites for Radioactive Waste The withdrawal of Nevada's Yucca Mountain as a potential nuclear waste repository has reopened the debate over how and where to dispose of spent nuclear fuel and high-level nuclear waste. In an article in the July 10 issue of Science, University of Michigan geologist Rodney Ewing and Princeton University nuclear physicist Frank von Hippel argue that, although federal agencies should set standards and issue licenses for the approval of nuclear facilities, local communities and states should have the final approval on the siting of these facilities. The authors propose the development of multiple sites that would service the regions where nuclear reactors are located. "The main goal..., should be to provide the United States with multiple process that requires acceptance by host communities and states," the authors write. Ewing and von Hippel also analyze the reasons why Yucca Mountain, selected by Congress in 1987 as the only site to be investigated for long-term nuclear waste disposal, finally was shelved after more than three decades o often controversial debate. The reasons include the site's geological problems, management problems, important changes in the Environmental Protection Agency's standard, unreliable funding and the failure to involve local communities in the decision-making process. Going forward, efforts should be directed at locating storage facilities in the nation's northeastern, southeastern, midwestern and western regions, and states within a given region should be responsible for developing solutions that suit their particular circumstances. Transportation of nuclear waste over long distances, which was a concern with the Yucca Mountain site, would be less of a problem because temporary storage or geological disposal sites could be located closer to reactors. "This regional approach would be similar to the current approach in Europe, where spent nuclear fuel and high-level nuclear waste from about 150 reactors and reprocessing plants is to be moved to a number of geological repositories in a variety of rock types," said Rodney Ewing, who has written extensively about the impact of nuclear waste management on the environment and who has analyzed safety assessment criteria for the controversial Yucca Mountain nuclear waste repository.

单选题The staffs of the company are always courteous and helpful.A. efficientB. respectableC. well-informedD. respectful

单选题Radioactive Wastes One of the major problems of nuclear energy is the inability of scientists to discover a safe way to dispose of the radioactive wastes which occur throughout the nuclear process. Many of these wastes remain dangerously active for tens of thousands of years, while others have a life span closer to a quarter of a million years. Various methods have been used to date, but all have revealed weaknesses, forcing scientists to continue their search. The nuclear process involves several stages, with the danger of radioactivity constantly present. Fuel for nuclear reactors comes from uranium ore (铀矿石), which, when mined, spontaneously produces radioactive substances as by-products. This characteristic of uranium ore went undetected for a long time, resulting in the deaths, due to cancer, of hundreds of uranium miners. The United States attempted to bury much of its radioactive waste material in containers made of steel covered in concrete and capable of holding a million gallons. For a long time it was believed that the nuclear waste problem had been solved, until some of these tanks leaked, allowing the radioactive wastes to seep into the environment. Canada presently stores its nuclear waste in underwater tanks, with the long-term effects largely unknown. However, plans are under consideration for above-ground storage of spent fuel from reactors. These plans include the building of three vast concrete containers, which would be two stories high and approximately the length and width of two football fields. Other suggestions include enclosing the waste in glass blocks and storing them in underground caverns, or placing hot containers in the Antarctic region, where they would melt the ice, thereby sinking down about a mile. This idea has since been abandoned because of the possible adverse effect on the ice sheets.

单选题During the SARS period, it is especially important to {{U}}ventilate{{/U}} the room.

单选题When Liam McGee departed as president of Bank of America in August, his explanation was surprisingly straight up. Rather than cloaking his exit in the usual vague excuses, he came right out and said he was leaving to pursue my goal of running a company. Broadcasting his ambition was "very much my decision," McGee says. Within two weeks, he was talking for the first time with the board of Hartford Financial Services Group, which named him CEO and chairman on September 29. McGee says leaving without a position lined up gave him time to reflect on what kind of company he wanted to run. It also sent a clear message to the outside world about his aspirations. And McGee isn"t alone. In recent weeks the No. 2 executives at Avon and American Express quit with the explanation that they were looking for a CEO post. As boards scrutinize succession plans in response to shareholder pressure, executives who don"t get the nod also may wish to move on. A turbulent business environment also has senior managers cautious of letting vague pronouncements cloud their reputations. As the first signs of recovery begin to take hold, deputy chiefs may be more willing to make the jump without a net. In the third quarter, CEO turnover was down 23% from a year ago as nervous boards stuck with the leaders they had, according to Liberum Research. As the economy picks up, opportunities will abound for aspiring leaders. The decision to quit a senior position to look for a better one is unconventional. For years executives and headhunters have adhered to the rule that the most attractive CEO candidates are the ones who must be poached. Says Korn Ferry, senior partner Dennis Carey: "I can"t think of a single search I"ve done where a board has not instructed me to look at sitting CEOs first." Those who jumped without a job haven"t always landed in top positions quickly. Ellen Marram quit as chief of Tropicana when the business became part of PepsiCo (PEP) a decade ago, saying she wanted to be a CEO. It was a year before she became head of a tiny Internet-based commodities exchange. Robert Willumstad left Citigroup in 2005 with ambitions to be a CEO. He finally took that post at a major financial institution three years later. Many recruiters say the old disgrace is fading for top performers. The financial crisis has made it more acceptable to be between jobs or to leave a bad one. "The traditional rule was it"s safer to stay where you are, but that"s been fundamentally inverted," says one headhunter. "The people who"ve been hurt the worst are those who"ve stayed too long."

单选题 A Biological Clock Every living thing has what scientists call a biological clock that controls behavior. The biological clock tells {{U}} {{U}} 1 {{/U}} {{/U}}when to form flowers and when the flowers should open. It tells {{U}} {{U}} 2 {{/U}} {{/U}}when to leave the protective cocoons and fly away, and it tells animals and human beings when to eat, sleep and wake. Events outside the plant and animal {{U}} {{U}} 3 {{/U}} {{/U}}the actions of some biological docks. Scientists recently found, for example, that a tiny animal changes the color of its fur {{U}} {{U}} 4 {{/U}} {{/U}}the number of hours of daylight. In the short {{U}} {{U}} 5 {{/U}} {{/U}}of winter, its fur becomes white. The fur becomes gray brown in color in the longer hours of daylight in summer. Inner signals control other biological clocks. German scientists found that some kind of internal clock seems to order birds to begin their long migration {{U}} {{U}} 6 {{/U}} {{/U}}twice each year. Birds {{U}} {{U}} 7 {{/U}} {{/U}}flying become restless when it is time for the trip, {{U}} {{U}} 8 {{/U}} {{/U}}they become calm again when the time of the flight has ended. Scientists say they are beginning to learn which {{U}} {{U}} 9 {{/U}} {{/U}}of the brain contain biological clocks. An American researcher, Martin Moorhead, said a small group of cells near the front of the brain {{U}} {{U}} 10 {{/U}} {{/U}}to control the timing of some of our actions. These {{U}} {{U}} 11 {{/U}} {{/U}}tell a person when to {{U}} {{U}} 12 {{/U}} {{/U}}, when to sleep and when to seek food. Scientists say there probably are other biological clock cells that control other body activities. Dr. Moorhead is studying {{U}} {{U}} 13 {{/U}} {{/U}}our biological clocks affect the way we do our work. For example, most of us have great difficulty if we must often change to different work hours. {{U}} {{U}} 14 {{/U}} {{/U}}can take many days for a human body to accept the major change in work hours. Dr. Moorhead said industrial officials should have a better understanding of biological clocks and how they affect workers. He said {{U}} {{U}} 15 {{/U}} {{/U}}understanding could cut sickness and accidents at work and would help increase a factory's production.

单选题Edwin Hubble Edwin Hubble changed our ideas about the universe and how it developed. The work of few other scientists changed our understanding of 【51】 suddenly. He made his most important discoveries in the 1920s. Today, other scientists continue the work he began back then. Edwin Powell Hubble was born in 1889 in Marshfield, Missouri. He 【52】 his early years in the state of Kentucky. Then he moved with his family to Chicago, Illinois. He attended the University of Chicago, taking mathematics and astronomy 【53】 his specialty. As a student, Hubble was also a member of the University''s basketball team and an excellent boxer. Several people urged him 【54】 for the world heavy weight boxing championship after college. Instead he decided to continue his 【55】 . In his first observations from Mount Wilson, California, Hubble used a telescope with one-hundred fifty-two and began 【56】 more and more distant objects. His first great discovery was made 【57】 he recognized a Cepheid variable star. Cepheid variable stars are stars whose brightness changes at regular periods. Hubble then began to observe more details about galaxies. He studied their shapes and brightness. By 1925, he had made enough observations to say that the universe is organized into many shapes and sizes. As stars differ from one another, he said, 【58】 galaxies. According to his observations, the galaxies have a center, and arms of matter that seem to the center like a pinwheel. Other are shaped 【59】 baseballs or eggs. A few have no special 【60】 Hubble proposed a system to describe galaxies by their shape. His system is still used today. He also showed that 【61】 are similar in the kinds of bright objects they contain. All galaxies, 【62】 , are related to each other much as members of a family are related to each other. In the late 1920s, Hubble studied the movement of galaxies through space. His investigation led to the most important 【63】 discovery of the 20th century—the expanding universe. Hubbies discovery 【64】 a major change in our ideas of the universe. The universe had not been quiet and unchanging since the beginning of time, as many people had thought. It was expanding. The expanding often is 【65】 the Big Bang.

单选题Mr. Henley has {{U}}accelerated{{/U}} his sale of shares over the past year. A. held B. expected C. offered D. increased

单选题It was said that after his father's death, he possessed nearly half of his father's wealth,A. wastedB. ownedC. purchasedD. sold