单选题It"s a gorgeous day anyway.

单选题Do you follow what I am saying?

单选题Cooking Off Fumes Cause Tumor The leading cause of lung cancer among women in the city was cooking oil fumes while men are more likely to develop the disease from smoking, said medical experts after a five-year research study. Doctors announced the results yesterday with analysis on some new tendencies in lung cancer. They said patients are younger, especially women. According to the Shanghai Tumor Research Institute, more local residents die of lung cancer in the city than anything else. Following breast cancer, it has the second-highest incidence rate. "An unhealthy lifestyle is a very important reason for lung cancer," said Dr. He Yumin from Shanghai Minshen Traditional Chinese Medicine Tumor Diagnosis and Treatment Center. He followed 2,276 lung cancer patients for five years. Among them, 1,483 were male. Smoking causes 70 percent of cases among men while only 18 percent of female patients developed cancer from smoking or inhaling second-hand smoke, according to the report. However, more than 60 percent of women with the disease had long-term, close contact with strong oil fumes from cooking and complained about irritated eyes and throat. About 32 percent of women fried foods in boiling oil in unventilated kitchens and about 25 percent of women"s bedrooms were adjacent to the kitchen. However, local women were surprised to learn cooking oil fumes could lead to cancer. Some claimed they may change food preparation methods. "Unless my family and I don"t eat at home every day, I must stay in the kitchen to cook," said Xu Li, a 45-year-old local woman. "I know the fumes are bad for the skin, but it is the first time I heard that it can result in lung cancer. I have already started frying less." Doctors said women"s lung cancer had few links to personal health and physical condition, but was closely related to family cancer history, unhealthy dietary habits and weak immune systems. Other experts agreed with He. "Smoking is by far the biggest cause of lung cancer for men," said Dr. Tan Binyong, honorary president of the Respiratory Disease Institute at Fudan University"s Medical College. "It"s true that second-hand smoke and cooking fumes are the main causes among women." He"s research also warned people not to stand near of stalls selling fried foods due to the poor quality of oils used. The chance of catching lung cancer is three times higher if exposed to the fume for a long time, experts said.

单选题Brothers and sisters often look a bit different from each other because

单选题Einstein's theory of relativity is so abstruse that very few people can {{U}}appreciate{{/U}} it.

单选题Early universities did not originate as institutions, but began instead as collections of scholars.

单选题I don' t have too much time. Could you tell it ______?A. in detailsB. presentlyC. happilyD. briefly

单选题{{B}}第二篇{{/B}} Elizabeth Hazen and Rachel Brown copatented one of the most widely acclaimed wonder drugs of the post-Second World War years. Hazen and Brown's work was stimulated by the wartime need to find a cure for the fungus(真菌类) infections that afflicted many military personnel. Scientists had been feverishly searching for an antibiotic toxic enough to kill the fungi but safe enough for human use, since, unfortunately, the new "wonder drugs" such as penicillin and streptomycin(链霉素) killed the very bacteria in the body that controlled the fungi. It was to discover a fungicide without that double effect that Brown, of New York State's Department of Health Laboratories at Albany, and Hazen, senior microbiologist at the Department of Health in New York, began their long-distance collaboration. Based upon Hazen's previous research at Columbia University, where she had built an impressive collection of fungus cultures, both were convinced that an antifungal organism already existed in certain soils. They divided the work. Hazen methodically screened and cultured scores of soil samples, which she then sent to her partner, who prepared extracts, isolated and purified active agents, and shipped them back to New York, where Hazen could study their biological properties. On a 1948 vacation, Hazen accidentally collected a clump of soil from the edge of W.B. Nourse's cow pasture in Fauquier County, Virginia, that, when tested, revealed the presence of the microorganisms. In farm owner Nourse's honor, Hazen named it Streptomyces noursci , and within a year the two scientists knew that the properties of their substance distinguished it from previously described antibiotics. After further research they eventually reduced their substance to a fine, yellow powder, which they first named "fungiciden", then renamed "nystatin"(to honor the New York State laboratory) when they learned the previous name was already in use. Of their major discovery, Brown said lightly that it simply illustrated "how unpredictable consequences can come from rather modest beginnings."

单选题The ice is not thick enough to bear the weight of a tank. A. suffer B. accept C. receive D. endure

单选题Step Back in Time Do you know that we live a lot longer now than the people who were born before us? One hundred years ago the average woman lived to be 45. But now, she can live until at least 80. One of the main reasons for people living longer is that we know how to look after ourselves better. We know which foods are good for U. S. and what we have to eat to make sure our bodies get all the healthy things they need. We know why we sometimes get ill and what to do to get better again. And we know how important it is to do lots of exercise to keep our hearts beating healthily. But in order that we don"t slip back into bad habits, let"s have a look at what life was like 100 years ago. Families had between 15 and 20 children, although many babies didn"t live long. Children suffered from lots of diseases, especially rickets (佝偻病) and scurvy (坏血病), which are both caused by bad diets. This is because many families were very poor and not able to feed their children well. Really poor families who lived in crowded cities like London and Manchester often slept standing up, bending over a piece of string, because there was no room for them to lie down. People didn"t have fridges until the 1920s. They kept fresh food cold by storing it on windowsills(窗台板), blocks of ice, or even burying it in the garden. Some children had to start work at the age of seven or eight to earn money for their parents. If you had lived 100 years ago, you might well be selling matchsticks(火柴杆)(a job done by many children)or working with your dad by now.

单选题The study was the first to tell the difference between 7 and 8 hours of sleep a night.

单选题 World Heart Day Sunday was World Heart Day. The World Heart Federation and its member groups in more than one hundred countries organized the celebrations. The World Health Organization and other United Nations agencies provided support for the {{U}} {{U}} 1 {{/U}} {{/U}}. World Heart Day was first observed six years {{U}} {{U}} 2 {{/U}} {{/U}}. Organizers proposed the event as a way to help reduce the spread of heart disease. The World Heart Federation says heart {{U}} {{U}} 3 {{/U}} {{/U}}kills seven-teen million people each year. The group urges people to be active and have a good, healthy diet. It also warns {{U}} {{U}} 4 {{/U}} {{/U}}activities known to increase a person's risk of heart attack or stroke. Some of the warnings are directed at children. The World Heart Federation says about twenty-two million boys and girls under the age of five are obese-severely overweight. Children are normally energetic and active. {{U}} {{U}} 5 {{/U}} {{/U}}, two thirds of all children are not active enough. Such children greatly {{U}} {{U}} 6 {{/U}} {{/U}}their risk of becoming obese. They also increase their {{U}} {{U}} 7 {{/U}} {{/U}}of developing heart disease or other disorders. One message of World Heart Day is to eat right. Children {{U}} {{U}} 8 {{/U}} {{/U}}eat a healthy and balanced diet. Also, limit sugary drinks, sweets and eating between meals. The World Heart Federation urges parents to keep their children {{U}} {{U}} 9 {{/U}} {{/U}}. It says physical exercise helps to decrease the risk of obesity and {{U}} {{U}} 10 {{/U}} {{/U}}a child healthy. Obese children often become obese adults. {{U}} {{U}} 11 {{/U}} {{/U}}you believe your child is too heavy, talk with a health care provider. The World Heart Federation is also concerned about the effects of tobacco on young people. It says the younger someone begins to smoke, the {{U}} {{U}} 12 {{/U}} {{/U}}the chance of a health problem tied to smoking. Half of the young people who continue to smoke are {{U}} {{U}} 13 {{/U}} {{/U}}to die later in life from a smoking-related disease. The group says almost half of all children live with a smoker. It says children who live with a {{U}} {{U}} 14 {{/U}} {{/U}}can breathe an amount of tobacco equal to more than two thousand cigarettes. And that is by the time they are five years old. The World Heart Federation also says parents should warn children not to be {{U}} {{U}} 15 {{/U}} {{/U}}by tobacco companies. And it says parents who smoke should try to stop.

单选题It is easier to adapt to new situations if one has a flexible attitude.A. changeableB. fashionableC. moveableD. elastic

单选题A future government will be in the hands of {{U}}an extraordinary{{/U}} man, who was wrong punished twice, then clawed his way to the top.

单选题Gadfly was too much exhausted to wake easily when once asleep.A. worn outB.--drearyC. reluctantD. chary

单选题After a day's fierce fighting, the enemy finally had to {{U}}remove{{/U}} their troops from the occupied area.

单选题15 Million Americans Suffer from Social Anxiety Disorder Social anxiety disorder prevents some 15 million Americans from leading normal social and romantic lives, a new survey finds. The disorder leaves many isolated, ashamed and often misdiagnosed. Thirty-six percent of those with social anxiety disorder have symptoms for 10 years or more before seeking help, the Anxiety Disorders Association of America reports. "Social anxiety disorder is when somebody has an intense, persistent and irrational fear of social or performance situations," Jerilyn Ross, the association's president and CEO, said during a teleconference Wednesday. "The condition causes people to avoid common, everyday situations and even other people for fear of being judged or criticized or humiliated or embarrassing themselves," Ross said. Social anxiety disorder can interfere with daily routines and job performance, Ross noted. "It also makes it very difficult for people to develop friends and romantic partnerships," she said. People with this disorder recognize their fear is excessive and irrational, Ross noted. "But they feel powerless to do anything about it," she said. Social anxiety disorder can start in the early teens, Dr. Mark H. Pollack, director of the Center for Anxiety and Traumatic Stress Disorders and a professor of psychiatry at Harvard Medical School, said during the teleconference. "This is a disorder that starts affecting people early on," Pollack said. "The typical age of onset is early adolescence, age 12 or 13, and many individuals report a history of anxiety dating back to earlier childhood." The disorder also has physical symptoms, including heart palpitations, feelings that their throat will close up, sweating, blushing, faintness, trembling and stammering, Ross said. Among people with the disorder, 75 percent said the condition affected their ability to do normal activities. In addition, 69 percent said they didn't want people to think they were crazy, and 58 percent said they were embarrassed by their condition, Ross said. However, when the condition is diagnosed and treated, many reported improvement in their lives. In fact, 59 percent who were receiving treatment said treatment had a positive effect on their ability to have a romantic relationship. In addition, 39 percent who had received treatment said knowing that treatment can be successful aided their decision to get help, Ross noted.

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。 {{B}} How to Determine a Topic for Research{{/B}} Because you are going to put a lot of your time and energy into your research project(项目),the topic is especially important. In many instances your instructor may give a specific(特殊的)topic. If this is done, you have little choice, but most instructors will permit or even welcome a slightly changed focus(中心)in a topic if it is supported by good thinking. In some of your classes, the instructor may present a suggested list of several topics from which you are to make a choice. If this is done, do not simply select the first idea that attracts your attention. It may be one with which you will soon become bored, or it may be one on which you would have difficulty finding all the necessary information. Looking at the topics, try to consider how you might go about developing each of them. When you find out what seems especially interesting and worthwhile(值得骄傲的),do a bit checking in the library to see if you can get the basic resources you will need. Choosing a good research topic does not necessarily mean finding something that has a lot written about it. Many times you will have to research around a topic in order to find out the most useful information. Exciting and original topics often come to mind by combining two completely different interests. Let us say that you are interested in child psychology(心理学的)and in sports. Perhaps you can combine these into a study of the effect that is watching(可得到的)on the subject, you can research the topic individually and, by putting your information together, then draw a conclusion.

单选题Engineers use the principles of aerodynamics in designing airplanes and other objects affected by aerodynamic forces.

单选题Have you talked to her lately ?