单选题The polar regions are generally covered with ice and snow.

单选题First editions of certain popular books cannot be obtained {{U}}for love or money{{/U}}. A.at any place B.at any price C.in any language D.in any country

单选题 阅读下面这篇短文，短文后列出7个句子，请根据短文的内容对每个句子做出判断。 Among all cancers, lung cancer is the biggest killer: more than 100,000 Americans die of the disease each year. Giving up smoking is one way to reduce the risk, but another answer may lie in the kitchen, according to a report in British medical journal The Lancet. Since 1957, a team of researchers has monitored the dietary habits and medical histories of 2,000 middle-aged men employed by the Western Electric Co. in Chicago. Led by Dr. Pritichard Shekelle of Chicago's Rush--Presbyterian--St. Luke's medical Centre, the team recently began to sort out the links between the subjects' dietary patterns and cancer. Other animal and human studies has suggested that vitamin A might offer some protection against lung cancer, but did not distinguish vitamin A made in the body from that in carotene (胡萝卜素), which is abundant in a variety of vegetables and fruits, including carrots, spinach, broccoli, squash, tomatoes and apples. The Western Electric study showed little correlation (相互关系)between the incidence of lung cancer and the consumption of foods containing performed vitamin A. But the data on carotene intake (摄入)revealed a significant relationship. Among the 488 men who had the lowest carotene consumption, there were 14 cases of lung cancer; in a group of the same size that ate the most carotene, only two eases developed. The apparent protective effect of carotene held up even for long-time smokers. Further studies will be necessary before the link between lung cancer and carotene can be firmly established. Meanwhile, researchers warn against taking large amounts of vitamin-A supplements, which can be extremely poisonous in high doses. Instead, they advise a well-balanced diet that includes foods rich in carotene.

单选题Norwich, the capital of the part of Britain known as East Anglia, has been in existence for more than two thousand years. It began as a small village beside the River Wensum. At the time of the Norman invasion in 1066 it had grown to become one of the largest towns in England. In 1066, Norwich was still one of the smallest town in England.A. RightB. WrongC. Not mentioned

单选题If the right first more on the puzzle above has you stumped, look in the back of this magazine under Creative Problem Solving.A. boredB. angriedC. sadD. confused

单选题He isdetermined to consolidate his power.

单选题Some other illnesses may exhibit symptoms similar to those of flu and anthrax.

单选题{{B}}第二篇{{/B}} {{B}}Medical Journals{{/B}} Medical journals are publications that report medical information to physicians and other health professionals. In the past, these journals were available only in print. With the development of electronic publishing, many medical journals now have Web sites on the Internet, and some journals publish only online. A few medical journals, like the Journal of the American Medical Association, are considered general medical journals because they cover many fields of medicine. Most medical journals are specialty journals that focus on a particular area of medicine. Medical journals publish many types of articles. Research articles report the results of research studies on a range of topics varying from the basic mechanisms of diseases to clinical trials that compare outcomes of different treatments. Review articles summarize and analyze the information available on a specific topic based on a careful search of the medical literature. Because the results of individual research studies can be affected by many factors, combining results from different studies on the same topic can be helpful in reaching conclusions about the scientific evidence for preventing, diagnosing or treating a particular disease. Case conferences and case reports may be published in medical journals to educate physicians about particular illnesses and how to treat them. Editorials in medical journals are short essays that express the views of the authors, often regarding a research or review article published in the same issue. Editorials provide perspective on how the current article fits with other information on the same topic. Letters to the editor provide a way for readers of the medical journal to express comments, questions or criticisms about articles published in that journal.

单选题The best olive oil is obtained from olives that are harvested just after they ripen.______

单选题I must apologize for my {{U}}outrageous{{/U}} behavior.

单选题Trees, shrubs, flowers, and grass give character and interest to the parks. A. vines B. vegetables C. bushes D. weeds

单选题The police tried in vain to break up the protest crowds in front of the government building.A. unskillfullyB. violentlyC. ineffectivelyD. eventually

单选题Early cancer screening Can help reduce significantly

单选题Different {{U}}hypotheses{{/U}} have been put forward to explain why UFOs exist.

单选题Recent pressure at work may account for his behavior.

单选题It has been said that the Acts provided a new course of action and did not merely {{U}}regulate{{/U}} or enlarge an old one. A. control B. limit C. replace D. offset

单选题We have taken effective measures to preserve our natural resources.A. protectB. reserveC. consumeD. save

单选题Tom is still full of beans at 70.A. courageousB. kindC. energeticD. single

单选题Revolutionary developments in China's astronomy took place in the 1960's.A. commencedB. occurredC. were disputedD. were exchanged

单选题CT Scans and Lung Cancer Small or slow-growing nodules (小结节) discovered on a lung scan are unlikely to develop into tumors over the next two years, researchers reported on Wednesday. The findings reported in the New England Journal of Medicine, could help doctors decide when to do more aggressive testing for lung cancer. They could also help patients avoid unnecessarily aggressive and potentially harmful testing when lesions (损伤) found. Lung cancer, the biggest cancer killer in the United States and globally, is often not diagnosed until it has spread. It kills 159,000 people a year in the United States alone. The work is part of a larger effort to develop guidelines to help doctors decide what to do when such growths, often discovered by accident, appear in a scan. High-tech X-rays called CT scans can detect tumors-but they see all sorts of other blobs (模糊的一团) that are not tumors, and often the only way to tell the difference is to take a biopsy (活检), a dangerous procedure. At the moment, routine lung cancer screening is considered impractical because of its high cost and because too many healthy people are called back for further testing. Good guideline could help make lung cancer screening practical, Dr. Rob van Kiaveren of the Erasmus Medical Center in Rotterdam, the Netherlands, who led the new study, said in a telephone interview. The team looked at 7, 557 people at high risk for lung cancer because they were current and former smokers. All received multidetector (多层螺旋) CT scans that measured the size of any suspicious-looking modules. Volunteers who had nodules over 9.7 mm in width, or had growth of 4.6 mm that grew fast enough to more than double in volume every 400 days, were sent for further testing. Of the 196 people who fell into that category, 70 were found to have lung cancer, 10 additional cases were found years later. But of the 7, 361 who tested negative during screening only 20 lung cancer cases later developed. In a second round of screening done one year after the first, 1.8 percent were sent to the doctor because they had a nodule that was large or fast-growing. More than half turned out to have lung cancer. The result means that if the screening test says you don't have lung cancer, you probably don't, the researcher said. "The chances of finding lung cancer one and two years after a negative first-round test were 1 in 1,000 and 3 in 1,000 respectively, "they concluded.