单选题 (21) summary of the physical and chemical (22) of life must begin, not on the Earth, but (23) the Sun; in fact, (24) the Sun's very center. (25) is here that is to be found the (26) of the energy that the Sun constantly (27) space (28) light and heat. This energy is liberated at the center of the Sun as billions upon billions of nuclei hydrogen atoms (29) each other and (30) to form nuclei of helium, and, (31) doing so, (32) some of the energy that is stored in the nuclei of atoms. The output of light and heat of the Sun (33) that some 600 million tons of hydrogen (34) helium in the Sun every second. This the Sun (35) for several thousands of millions of years.

单选题Opponents of legalization often argue that inside the breast of all doctors, both sides of the argument agree, beats the heart of a Mengele ______. A. for whom patients must be protected B. against whom patients must be protected C. against whom patients must protect themselves D. for whom patients must be being protected

单选题{{B}}Passage 1{{/B}} Community cancer clusters are viewed quite differently by citizen activists than by epidemiologists. Environmentalists and concerned local residents, for instance, might immediately suspect environmental radiation as the culprit when a high incidence of cancer cases occurs near a nuclear facility. Epidemiologists, in contrast, would be more likely to say that the incidences were "inconclusive" or the result of pure chance. And when a breast cancer survivor, Lorraine Pace, mapped 20 breast cancer cases occurring in her West Islip, Long Island, community, her rudimentary research efforts were guided more by hope--that a specific environmental agent could be correlated with the cancers than by scientific method. When epidemiologists study clusters of cancer cases and other noncontagious conditions such as birth defects or miscarriage, they take several variables into account, such as background rate (the number of people affected in the general population), cluster size, and specificity (any notable characteristics of the individual affected in each case). If a cluster is both large and specific, it is easier for epidemiologists to assign blame. Not only must each variable he considered on its own, but it must also be combined with others. Lung cancer is very common in the general population. Yet when a huge number of cases turned up among World War Ⅱ shipbuilders who had all worked with asbestos, the size of the duster and the fact that the men had had similar occupational asbestos exposures enabled epidemiologists to assign blame to the fibrous mineral. Although several known carcinogens have been discovered through these kinds of occupational or medical clusters, only one community cancer cluster has ever been traced to an environmental cause. Health officials often discount a community’s suspicion of a common environmental cause because citizens tend to include cases that were diagnosed before the afflicted individuals moved into the neighborhood. Add to this the problem of cancer's latency. Unlike an infectious disease such as cholera, which is caused by a recent exposure to food or water contaminated with the cholera bacterium, cancer may have its roots in an exposure that occurred 10 to 20 years earlier. Do all these caveats mean that the hard work of Lorraine Pace and other community activists is for nothing? Not necessarily. Together with many other reports of breast cancer clusters on Long Island, the West Islip situation highlighted by Pace has helped epidemiologists lay the groundwork for a well designed scientific study.

单选题 The witness was ______ by the judge for failing to answer the question.

单选题The bags used to hold water are likely to be damaged by ______.

单选题I was twenty-five years old, and I'd just been (laid down) from my job as (division) manager (at) a (mortgage banking) firm.

单选题What is the passage mainly about?

单选题Without Bob's testimony, evidence of bribery is lacking and ______ in the case will be impossible. A. verdict B. sentence C. conviction D. acquittal

单选题As skies are filled with millions of migrating birds, European scientists say the seasonal miracle appears to depend on a seeming______: The fatter the bird, the more efficiently it flies.

单选题One country that is certain of the effect of films on tourism is Australia. The Tourist Office of Queensland say that Crocodile Dundee, 61 Paul Hogan, made Australia the popular 62 it is today. In the three years after Crocodile Dundee was 63 , visitor numbers doubled. 64 what makes people want to visit the place where a movie was filmed? In many cases the reason is 65 the film makes audiences 66 of the existence of a place. 67 the James Bond movie The Man with the Golden Gun was filmed in Phuket, Thailand, most Westerners had never heard of it. Today it is a major destination. Leonardo di Caprio's film The Beach has 68 tourism in another part of Thailand. The film is about the discovery of the most idyllic beach in the world. As a result the Thai authorities are 69 a tourist boom in the film's 70 ,Koh Phi Phi. Some people are influenced by a movie's 71 as much as its location, especially if it is a romance. Four Weddings and a Funeral has 72 that" The Crown" hotel in Amersham has been busy ever 73 the movie was first shown. In fact the bedroom where the 74 played by Hugh Grant and Andie McDowell spend their first night together is 75 for years ahead. "We've 76 the number of marriage proposals that have been made there," say the hotel 77 . It is not just the tourist boards who are happy 78 the influence of films on a destination. Residents of a rather run down area of London have seen house prices almost double 79 Julia Robert's romance with Hugh Grant in Notting Hill. Film stars, such as Madonna, who had previously thought of Notting Hill as a good place for a party, have now bought 80 there. Perhaps they hope to revive their romances.

单选题A friendship may be deep, lasting, or ______, casual and situational.

单选题Despite all the reports of physicians and health authorities, some individuals find that cigarette smoking is ______.

单选题He ______ himself bitterly for his miserable behavior that evening.(2007年中国人民大学考博试题)

单选题Professor Hawking is ______ as one of the world's greatest living physicists. A. dignified B. clarified C. acknowledged D. illustrated

单选题Distance education is enrollment and study with an educational institution that provides lesson materials prepared in a sequential and logical order for study by students on their own. When each lesson is completed, the student mails or transmits the assigned work to the institution for correction, grading, comment, and subject matter guidance by qualified instructors. Corrected assignments are returned promptly to the student. This exchange provides a personalized student-teacher relationship. If a student slows his or her pace or fails to send assignments, the school provides encouragement. Although some institutions provide employment placement information and assistance, no reputable school ever guarantees a job to graduates. Distance education and self-study are different. Self-study materials provide no instructional service. Corrected assignments, examinations, and special help provided by a qualified facility are vital to a good learning situation. However, these are not part of self-study. There are many self-study courses and recordings available, and they may have value, but they clearly are not correspondence or distance education courses. Some institutions offer combination courses that provide training-in-residence for students who complete their distance education lessons. In-service or on-the-job training is required or provided with other courses and is a feature of many vocational distance education programs. Quality distance education institutions screen prospective students to assure that only those who can benefit from the courses are enrolled. While there are educational prerequisites for some academic subjects, interest and aptitude are the primary factors leading to success in most distance education courses. Because they provide alternative educational opportunities, distance education institutions try not to deny a prospective student the opportunity to succeed in a course; interest and experience are good indicators of future Success. Distance education courses vary greatly in scope, level, and length. Some have few lessons and require only weeks to complete, while others have a hundred or more assignments requiring three or four years of conscientious study. Also, a wide variety of subjects is offered. Subjects include yacht design, accounting, medical transcription, nutrition, robotics, travel agent training, gun repair, gem identification, computer programming, catering and cooking, and earning an entire high school diploma, just to name a few. There is an increasing recognition of "distance education" and many colleges offer credit for their distance learning courses or accept some distance education credits of resident students working toward a degree. In fact, many distance education institutions award their own academic degrees. Acceptance of students and awarding of academic credit is the prerogative of the receiving academic institution. Also, the employing organization may set its own credit acceptance policies.

单选题The report was unusual in that it insinuated corruption on the part of the minister.

单选题We must learn to______ erroneous ideas through debate and reasoning.

单选题New and bizarre crimes have come into being with the advent of computer technology. Organized crime to has been directly involved; the new technology offers it unlimited opportunities, such as data crimes, theft of services, property-related crimes, industrial sabotage, politically related sabotage, vandalism, crimes against the individual and financially related crimes... Theft of data, or data crime, has attracted the interest of organized criminal syndicates. This is usually the theft or copying of valuable computer program. An international market already exists for computerized data, and specialized fences are said to be playing a key role in this rapidly expanding criminal market. Buyers for stolen programs may range from a firm's competitors to foreign nations. A competitor sabotages a company's computer system to destroy or cripple the firm's operational ability, thus neutralizing its competitive capability either in the private or the government sector. This computer sabotage may also be tied to an attempt by affluent investors to acquire the victim firm. With the growing reliance by firms on computers for their recordkeeping and daily operations, sabotage of their computers can result in internal havoc, after which the group interested in acquiring the firm can easily buy it at a substantially lower price. Criminal groups could also resort to sabotage if the company is a competitor of a business owned or controlled by organized crime. Politically motivated sabotage is on the increase; political extremist groups have sprouted on every continent. Sophisticated computer technology arms these groups with awesome powers and opens technologically advanced nations to their attack. Several attempts have already been made to destroy computer facility at an air force base. A university computer facility involved in national defence work suffered more than $ 2 million in damages as a result of a bombing. Computer vulnerability has been amply documented. One congressional study concluded that neither government nor private computer systems are adequately protected against sabotage. Organized criminal syndicates have shown their willingness to work with politically motivated groups. Investigators have uncovered evidence of cooperation between criminal groups and foreign governments in narcotics. Criminal groups have taken attempts in assassinating political leaders... Computers are used in hospital life-support system, in laboratories, and in major surgery. Criminals could easily turn these computers into tools of devastation. By sabotaging the computer of a life-support system, criminals could kill an individual as easily as they had used a gun. By manipulating a computer, they could guide awesome tools of terror against large urban centers. Cities and nations could become hostages. Homicide could take a now form. The computer may become the hit man of the twentieth century. The computer opens vast areas of crime to organized criminal groups, both national and international. It calls on them to pool their resources and increase their cooperative efforts, because many of these crimes are too complex for one group to handle, especially those requiting a vast network of fences. Although criminals have adapted to computer technology, law enforcement has not. Many still think in terms of traditional criminology.