单选题 阅读下面这篇短文，短文后列出了7个句子，请根据短文的内容对每个句子作出判断。如果该句提供的是正确信息，请选择A项；如果该句提供的错误信息，请选择B项；如果该句的信息文章中没有提及，请选择C项。 {{B}} Using HIV Virus to Cure Cancer{{/B}} Scientists are planning to use human immunodeficiency (免疫缺陷) virus (HIV), one of mankind's most feared viruses, as a carrier of genes which can fight cancer and a range of diseases that cannot be cured. The experts say HIV has an almost perfect ability to avoid the body's immune (免疫的) defenses, making it ideal for carrying replacement genes into patients' bodies, according to the Observer. A team at the California-based Salk Institute, one of the world's leading research centers on biological sciences, has created a special new breed of HIV and has started negotiations with the US Food and Drug Administration (FDA) to begin clinical gene therapy (治疗) trials this year. The first trials are expected to involve patients suffering from cancers that cannot be cured by surgery although project leader Professor Inder Verma said the HIV technique would have "far wider applications". The plan remains very likely to cause controversy since it involves making use of a virus which has caused more than 22 million deaths around the world in the past two decades. Verma said that the idea of using HIV for a beneficial purpose was "shocking" but the fierce nature of HIV had disappeared by having all six of the potentially deadly genes removed. Illnesses such as various cancers are caused when a gene in a patient's body fails to work properly. In the past two years, breakthroughs in genetics (遗传学) have led gene therapy scientists to try and replace the genes that do not function normally. Unfortunately, the body's immune defenses have been known to attack the modified genes and make them lose their effects before they can start their task and progress in the field has been held up by the lack of a suitable carrier. The HIV virus has the ability to escape from, and then destroy, the immune defense ceils designed to protect our bodies and this makes it attractive to scientists as a way of secretly conveying replacement genes into patients' bodies.

单选题Jack Uconsumes/U a Pound of cheese a day.

单选题Medicine depends on other fields for basic information, particularly some of their specialized branches.

单选题The room was furnished with the simplest essentials, a bed, a chair, and a table.A. suppliedB. gatheredC. graspedD. made

单选题He was reluctant to admit he was wrong.

单选题 Sleep Problems Plague the Older Set Older Americans often have difficulty getting a good night's rest. It's a huge quality-of-life problem, experts say, because contrary to popular belief, seniors require about the same amount of sleep as younger adults. "Sleep problems and sleep disorders are not an inherent (固有的) part of aging," said Dr. Harrison G. Bloom, an associate clinical professor of geriatrics (老年病学) and medicine at the Mount Sinai School of Medicine in New York City. "It's pretty much of a myth that older people need less sleep than younger people." Yet in a study published recently in The American Journal of Medicine, researchers found that more than half of older Americans have problems getting the sleep they need. Older people tend to have "sleep fragmentation", meaning they wake up more often during the night, said study author Dr. Julie Gammck, an assistant professor of medicine in the Division of Geriatric Medicine at St. Louis University. They also seem to get less "REM" sleep, the type of sleep during which rapid eye movement occurs, Bloom added. It's unclear what role these naturally occurring changes in sleep patterns have on a person's quality of life, Bloom said. "What is important, though, is that older people often have actual sleep disorders and problems with sleep," he said. And, experts say, there is usually more than one cause. "Sleep trouble in older adults is typically associated with acute and chronic illnesses, including specific sleep disorders like sleep apnea (呼吸暂停) and restless leg syndrome that appear with greater frequency in older populations," said Michael V. Vitiello, a professor of psychiatry and behavioral sciences and associate director of the University of Washington's Northwest Geriatric Education Center. Taking multiple medications, as many older people do, can also lead to fatigue and "hypersomnia", or being tired all the time, Bloom added. Another big problem, he noted, is depression and anxiety. "Those are very commonly associated with sleep problems." Despite the prevalence (流行) of sleep difficulties in older adults, many patients aren't getting the help they need. As a result, problems like insomnia (失眠), restless leg syndrome and sleep apnea are underdiagnosed and undertreated, Bloom said.

单选题It was obvious that she was not going home.

单选题A prominent advocate of woman suffrage, Susan B. Anthony lectured throughout the Unites States for the cause of women's rights.A. raised moneyB. arranged meetingsC. wrote articlesD. gave speeches

单选题Approaches to Understanding Intelligences It pays to be smart, but we are not all smart in the same way. You may be a talented musician, but you might not be a good reader. Each of us is different. Psychologists disagree about what is intelligence and what are talents or personal abilities. Psychologists have two different views on intelligence. Some believe there is one general intelligence. Others believe there are many different intelligences. Some psychologists say there is one type of intelligence that can be measured with IQ tests. These psychologists support their view with research that concludes that people who do well on one kind of test for mental ability do well on other tests. They do well on tests using words, numbers or pictures. They do well on individual or group tests, and written or oral tests. Those who do poorly on one test, do the same on all tests. Studies of the brain show that there is a biological basis for general intelligence. The brains of intelligence people use less energy during problem solving. The brain waves of people with higher intelligence show a quicker reaction. Some researchers conclude that differences in intelligence result from differences in the speed and effectiveness of information processing by the brain. Howard Gardner, a psychologist at the Harvard School of Education, has four children. He believes that all children are different and shouldn"t be tested by one intelligence test. Although Gardner believes general intelligence exists, he doesn"t think it tells much about the talents of a person outside of formal schooling. He thinks that the human mind has different intelligences. These intelligences allow us to solve the kinds of problems we are presented with in life. Each of us has different abilities within these intelligences. Gardner believes that the purpose of school should be to encourage development of all of our intelligences. Gardner says that his theory is based on biology. For example, when one part of the brain is injured, other parts of the brain still work. People who cannot talk because of brain damage can still sing. So, there is not just one intelligence to lose. Gardner has identified 8 different kinds of intelligence, linguistic, mathematical, spatial, musical, interpersonal, intrapersonal, body-kinesthetic (身体动觉的), and naturalistic.

单选题A peculiarly pointed chin is his most memorable facial characteristic .

单选题Not everybody has the competence to do this job.A. competitionB. comparisonC. controlD. ability

单选题While we don"t agree, we continue to be friends.

单选题Gunpowder was used extensively in firearms prior to 1990.A. inB. aroundC. fromD. before

单选题Smart Window Windows not only let light in to cut down an electricity use for lighting, but the light coming through the window also provides heat. However, windows are not something people typically associate with being a cutting edge technology. Researchers are now working on new technologies that enable a window to quickly change from clear to dark and anywhere in between with a flip of a switch. "It took us a long time to figure out what a window really is," says Claes Granqvist. He"s a professor of solid-state physics at Uppsala University in Sweden. "It"s contact with the outside world. You have to have visual contact with the surrounding world to feel well." So, windows and natural light are important for improving the way people feel when they"re stuck indoors. Yet, windows are the weak link in a building when it comes to energy and temperature control. In the winter, cold air leaks in. When it"s hot and sunny, sunlight streams in. All of this sunlight carries lots of heat and energy. And all of this extra heat forces people to turn on their air conditioners. Producing blasts of cold air, which can feel so refreshing, actually suck up enormous amounts of electricity in buildings around the world. Windows have been a major focus of energy research for a long time. Over the years, scientists have come up with a variety of strategies for coating, glazing, and layering windows to make them more energy efficient. Smart windows go a step further. They use chromogenic technologies which involve changes of color. Electrochromic windows use electricity to change color. For example, a sheet of glass coated with thin layers of chemical compound such as tungsten oxide works a bit like a battery. Tungsten oxide is clear when an electric charge is applied and dark when the charge is removed, that is, when the amount of voltage is decreased, the window darkens until it"s completely dark after all electricity is taken away. So applying a voltage determines whether the window looks clear or dark. One important feature that makes a smart window so smart is that it has a sort of "memory." All it takes is a small jolt of voltage to turn the window from one state to the other. Then, it stays that way. Transitions take anywhere from 10 seconds to a few minutes, depending on the size of the window. The development of smart windows could mean that massive air conditioning systems may no longer need. "In the future," Granqvist says, "our buildings may look different."

单选题Gardner thinks that his theory has a ________ .

单选题The Klondike was the scene of one of the biggest gold rushes the world has ever known.

单选题The council meeting terminated at 2 o"clock.

单选题It was amazing that the boy was able to solve the problem so quickly. A. frustrating B. unexpected C. reasonable D. surprising

单选题Relief workers were shocked by what they saw.

单选题The current external surplus declined {{U}}further{{/U}}.