单选题Many scientists have been probing psychological problems.

单选题Stomach Ulcer Stomach ulcers are the cause of severe pain for many people. Doctors have been able to help lessen the pain of ulcers. They could not cure them. Now doctors have discovered a cause of ulcers. This means they may have found a way to cure people who suffer from the stomach pain. Studies show that ten percent of the population will develop an ulcer at some time in their life. So a possible cure is good news for many people. Ulcers are wounds in the stomach that are similar to small cuts or tears. These wounds can harm the tissue in the stomach, the pipe that carries the food to the stomach or parts of the small intestines. Fluids in the stomach then increase the pain of an ulcer. How does a person know he or she has an ulcer? Doctors say most people with ulcers feel a burning pain in their chest or stomach. This pain often is called heart burn. It usually happens before eating or during the night. It causes some people to lose their desire to eat, or they are unable to keep food in their stomachs. Doctors believed that ulcers were caused by unusually strong stomach fluids, which damaged stomach tissue. Now they have discovered that most ulcers are caused by a bacterial organism called Hillico Bactor Pilorie or HPillorie. HPillorie bacteria are what make stomach produce extra stomach fluid. Doctors found that they can kill the bacteria with medicines called antibiotics. Health experts say the discovery of a cure for ulcers can save thousands of millions of dollars in medical costs. They also believe curing ulcers will reduce the number of people who develop stomach cancer. The number of people with stomach cancer is very high in Japan, Southeast Asia and parts of Africa. Doctors say a person is more likely to get an ulcer if his or her family has had one. In fact a person with the family history of ulcers is three times more likely to get one than other people. There are ways people can protect themselves from developing an ulcer. Doctors say it is more important to reduce the amount of strong fluids in the stomach. To do this, doctors say, people should not smoke cigarettes or drink alcohol. And they say people should reduce tension in their lives.

单选题The writer’s purpose of writing this article is to advise people

单选题Lower taxes would spur investment and help economic growth. A. spend B. require C. encourage D. attract

单选题U.S. Blacks Hard-hit by Cancer Death rates for cancer are falling for all Americans, but black Americans are still more likely to die of cancer than whites, the American Cancer Society said Monday. In a special report on cancer and blacks, the organization said blacks are usually diagnosed with cancer later than whites, and they are more likely to die of the disease. This could be because of unequal (不平等的) access to medical care, because blacks are more likely to have other diseases as well, and perhaps because of differences in the biology (生物学) of the cancer itself, the report added. "In general, black Americans have less hope of surviving five years after diagnosis than whites for all cancer sites and all stages of diagnosis," the report said. "In describing cancer statistics for black Americans, this report recognizes that many of the differences associated with race may be caused by unfair social and economic differences and unequal access to medical care." The cancer society said blacks should be encouraged to get check-ups (体格检查) earlier, when cancer is more treatable, and it said more research is needed to see if biological differences play a role. "The new statistics emphasize the continuing importance of wiping out these unfair social differences through public policy and education efforts," the organization said in a statement. But it also noted a drop in cancer death rates. "Cancer death rates in both sexes for all sites Combined have dropped greatly among black Americans since 1992, as have incidence rates (发生率)," said the report.

单选题The carelessness has some bad effects on his show. A. scores B. results C. influences D. luck

单选题Marriage Linked With Better Sleep Marriage may improve your sleep, and better sleep may improve your marriage, two new studies suggest. Women who are married or who have stable partners appear to sleep better than women who have never married or lost a panner, according to research from an eight - year study presented at the Associated Professional Sleep Societies annual meeting. They also found that marital (婚姻的)happiness lowers the risk of sleep problems, while marital conflict heightens the risk. Although married women overall slept more soundly than unmarried women, the researchers, from the University of Pittsburgh School of Medicine, did identify a "newlywed" effect. Women who were single at the start of the study but gained a partner had more restless sleep than women who were akeady married. The researchers speculated that newly married women were less adjusted to sleeping with their partner than those who had been married longer. The study included 360 middle - aged African--American, Caucasian and Chinese. American women who had taken part in the Study of Women' s Health Across the Nation. Researchers used in--home sleep studies, activity monitors to track sleep--wake patterns and relationship histories to look at the effect stable marriages, unstable marriages and marital transitions, such as a divorce, had on sleep. Another small study of 29 couples found that on a daily basis, the quality of a couple' s relationship and the quality of their sleep are closely linked. In that study, from the University of Arizona, 29 heterosexual (异性的) couples who shared a bed and did not have children completed sleep and relationship diaries for a week. The results showed that when men get better sleep, they are more likely to feel positive about their relationship the next day. And for women, problems in the relationship were Strongly associated with poor sleep for both themselves and their partner. "When we look at the data on a day - by - day basis, there seems to be a vicious cycle in which sleep affects next day relationship functioning, and relationship functioning affects the subsequent night's sleep," said principal investigator Brant Hasler, a clinical psychology doctoral candidate at the University of Arizona, in a press release. "In this cycle, conflict with one' s partner during the day leads to worse sleep that night, which leads to more conflict the following day. " The data from both studies suggest that sleep and relationship happiness are closely linked. The lesson for couples, especially those who are struggling with problems, is that paying attention to sleep habits may help solve other issues in the relationship.

单选题Men usually begin to worry about their weight when they are nearly 40.

单选题The use of the chemical may present a certain hazard to the laboratory workers.

单选题 下面有3篇短文，每篇短文后有5道题，每题后面有4个选项。请仔细阅读短文并根据短文回答其后面的问题。{{B}}第一篇{{/B}} {{B}} The Poverty Line{{/B}} In the United States during 1992, any family of four with an annual cash income of less than ＄14,335(before taxes) was considered poor. The dollar amount was called the poverty line, an economic measuring rod devised in 1964. the line was set at three times the amount needed to provide the cheapest nutritionally balanced diet. The poverty line is adjusted annually for inflation. While the poverty line in the United States was more than ＄14,000, the average annual per-person income in Bangladesh was ＄200, in Ethiopia average annual per-person income in Bangladesh was ＄200, in Ethiopia ＄130, in Haiti ＄340, and in Mall ＄265. Anyone in those nations with an income of ＄14,000 would be considered wealthy. During the Great Depression in the United States, when half the population was considered poor, a family with an income at the 1992 poverty line could afford to buy a house, a car, clothing, and food. The reality of poverty varies with location and social and political conditions. Poverty basically means a lack of, or an insufficient amount of, the three primary physical needs—food, clothing, and shelter. But for poverty to be recognized, it must exist alongside prosperity. Before the discovery of the New World, the American Indians would not have considered themselves poor, though they lived with only the bare necessities and a few handmade artifacts(人工制品). The severity of poverty varies, depending on the economic vitality of the nation in which it occurs. In the modern industrialized societies of the nation in which it occurs. In the modern industrialized societies of Western Europe, North America, and Japan, there are many government services provided to ease poverty—including free medical care and subsidized housing. The homeless of New York City and Los Angeles can usually find some shelter and a mission offering free meals.

单选题He never grumbled about working overtime.

单选题The inconvenience to users and economic cost to the nation {{U}}escalate{{/U}} rapidly.

单选题When an organization acquires a computer system, it decides precisely what forms of input would be most favorable.A. inexpressiveB. beneficialC. defensiveD. essential

单选题According to the New York Times' report, a combination of two new drugs could

单选题The {{U}}steadily{{/U}} rising cost of labor on the waterfront has greatly increased the cost of shipping cargo by water. A. gradually B. suddenly C. excessively D. exceptionally

单选题Privacy Worry May Keep HIV Patients from Therapy Patients infected with HIV are often concerned about the confidentiality of their HIV-positive status. In fact, some patients are so worried that they will actually give up treatment to prevent the release of this information, according to a report published in the August issue of AIDS Care. Dr. Kathryn Whetten-Goldstein and colleagues from Duke University, Durham. North Carolina, studied the confidentiality issues of 15 HIV-infected patients from rural North Carolina locations. They were divided into groups designed to explore their attitudes toward, and experiences with, breaches in confidentiality. "The fear of a breach in confidentiality is definitely affecting the care that HIV-infected patients receive, " Whetten-Goldstein said. "Most studied patients had experienced or knew someone who had experienced a breach in confidentiality. " "Two types of breaches occurred, " Whetten-Goldstein noted. "The first was a more obvious type of breach. One example was a nurse who told her child that her patient was HIV-positive out of concern that her child would play with the patient's child. " "The other type of breach was more subtle, one that providers might not consider breaches, " Whetten-Goldstein explained. "This type of breach involves providers talking about a patient's HIV status without the patient's knowledge of the interaction. " "The law allows the sharing of information between providers within the same institution, but patient's consent must be obtained before providers at different institutions can share information, " she pointed out. "Patients in the study wanted providers to tell them when they are going to share information with other providers and why it is being done," Whetten-Goldstein said. "They also felt that providers should be punished when a breach occurs. " "However, because patients are often reluctant to seek legal action which may further expose their status, they felt that the system should regulate itself, " she added.

单选题It is obvious that it has been too late to take action. A. true B. certain C. said D. apparent

单选题The chairman proposed that we should stop the meeting. A. stated B. declared C. suggested D. announced

单选题The employer {{U}}dictated{{/U}} the letter to his secretary, who wrote it down in shorthand.

单选题This table is strong and durable .