单选题His shoes were U shined/U to perfection．

单选题A lot of people could fall ill after drinking {{U}}contaminated{{/U}} water. A. boiled B. polluted C. mixed D. sweetened

单选题 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 tearsl. These wounds can harm the tissue in the stomach2, 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 stomach3. This pain often is called heartburn. 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 H Pilorie. H Pilorie 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 someone in 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 price of vegetables {{U}}fluctuates{{/U}} according to the weather. A. jumps B. rises C. falls D. changes

单选题An international team of research scientists has created a new kind of rice that contains Vitamin A. The researchers used genetic engineering to create the new rice. Genetic engineering is the technology of changing the genes of living things. The researchers say the rice could help millions of people who do not get enough Vitamin A in the food they eat. The findings were published in Science magazine. Vitamin A is necessary for the body's natural defense system against disease. Vitamin A is needed to help prevent skin and other tissues from drying out. It also produces a light-sensitive substance in the eyes. People who do not get enough Vitamin A cannot see well in the dark. They may develop a condition that dries the eyes. The condition can result in infections that lead to blindness. A lack of Vitamin A is a major cause of blindness among children. Health experts estimate that 124 million children around the world do not eat enough foods with Vitamin A. Vitamin A is found in fish liver oil and in the yellow part of eggs. Vegetables such as carrots and sweet potatoes contain beta carotene, a substance that the body changes into Vitamin A. Public health campaigns to provide Vitamin A to those who need it have proved costly. And they are not always effective. That has led researchers to try to create foods with the vitamin. Rice is one of the most common crops grown worldwide. However, normal rice lacks Vitamin A. Researchers at a laboratory in Switzerland found a way to change the genetic material of rice. They added three genes to the rice. The genes produce beta carotene, the chemical that our bodies change into Vitamin A. The new rice has a golden yellow color. The researchers say 200 grams of the rice have enough beta carotene to provide the necessary amount of Vitamin A. Biologist Mary Lou Guerinot of Dartmouth College wrote a commentary published with the report in science magazine. She said the rice is an excellent example of the good things that can be done with genetic engineering. However, critics of genetic engineering argue that changing plant genes could increase risks to human health or the environment.

单选题From my standpoint, you know, this thing is just ridiculous. A. position B. point of view C. knowledge D. opinion

单选题If headaches only occur at night, lack of fresh air is often the cause.

单选题Have you talked to her lately?A. lastlyB. shortlyC. recentlyD. immediately

单选题The revelation of his past led to his resignation.

单选题The eternal motion of the stars fascinated him.

单选题The committee was asked to Urender/U a report on the housing situation.

单选题You should have blended the butter with the sugar thoroughly, A. spread　 C. beaten B. mixed D. covered

单选题Diabetes (糖尿病) and Eye Damage Over 2 million Canadians have diabetes. It is the leading cause of blindness in North Americans under 65 years of age. Diabetes is a condition where the body either cannot produce enough insulin (胰岛素) or cannot respond properly to insulin. Insulin is important because it moves glucose (葡萄糖), a simple sugar, into the body"s cells from the blood. The food people eat provides the body with glucose, which is used by the cells as a source of energy. If insulin isn"t available or doesn"t work correctly to move glucose from the blood into the cells, glucose will stay in the blood, leading to high blood sugar levels. High blood sugar levels damage the blood vessels, including the tiny blood vessels in the eye. This leads to an eye disease known as diabetic retinopathy (糖尿病型视网膜病). The retina (视网膜) is an area at the back of the eye that changes light into nerve signals. With diabetic retinopathy, some blood vessels in the retina are lost, and some of the other blood vessels begin to "leak" blood. This causes the retina to swell, and gradually cuts off its supply of oxygen and nutrients (滋养物). Eventually, the retina starts to grow new blood vessels to replace the damaged ones. Unfortunately, these new vessels are not as strong as the old ones. They are more likely to break, causing bleeding in the eye. At first, people with diabetic retinopathy will not notice any symptoms. As the disease gets worse, they may notice blurred (模糊的) vision, black spots or flashing lights. As time goes on, it can progress to blindness. Everyone with diabetes is at risk for diabetic retinopathy, and the risk increases the longer you"ve had diabetes. Fortunately, you can reduce your risk. If you do not have diabetes, but think you may be at risk for this condition, visit your doctor to be screened for diabetes. If you do have diabetes: a) Have frequent eye check-ups. b) Make sure that you monitor your blood sugar frequently and use your medications as recommended by your doctor. There is evidence to show that keeping your blood sugar under tight control can slow down eye damage. c) If you have high blood pressure, follow your recommended diet and medications to keep it under control. If you are not sure whether you have high blood pressure, or whether your blood pressure is under control, discuss this with your doctor.

单选题He run away from the classroom in no time.A. immediately.B. timelyC. latelyD. bravely

单选题下面的短文有15处空白，请根据短文的内容为每处空白处确定一个最佳选项。 Freezing to Death for Beauty People in Beijing wear a lot of clothing during winter to fend(抵御) off the cold. In the United States, however, people wear {{U}}(51) {{/U}}, partly because the ear is the primary mode of transportation. Cars take {{U}}(52) {{/U}} straight to their workplaces, which are heated well. The American diet is full of calories, so their {{U}}(53) {{/U}} can afford to burn heat more quickly. Fewer layers of clothing give people the opportunity to stay {{U}}(54) {{/U}}. Lots of Yale girls wear skirts {{U}}(55) {{/U}}when it's 10 degrees Centigrade(摄氏温度的) outside. Some of them at least wear boots, tights(裤袜), and leg-warmers(暖腿套). Some, however, really just go for(选 择) the look {{U}}(56) {{/U}}the risk of health. These girls have nothing to prevent their legs {{U}}(57) {{/U}} the wind, and no socks to protect their feet. A mini skirt and a pair of stilettos(细高跟鞋) are all that they wear. Typically, the ones pursuing fashion are {{U}}(58) {{/U}}, with little body fat. Just by the nature of their bodies, they are already at a disadvantage compared with normal people in {{U}}(59) {{/U}}weather. I have always {{U}}(60) {{/U}}, whenever I pass these girls, how they manage to refrain from shivering and just smile like spring had arrived. And then there are the guys, The girls can be said to {{U}}(61) {{/U}}health for beauty..But why do guys {{U}}(62) {{/U}} so little? It is not like, once they shed(脱掉) some layers, they suddenly become better-looking. They are not exactly being fashionable when they {{U}}(63) {{/U}} wear sporty (花哨的) shorts and shower slippers in the midst of winter. It's not cute (喜人的). Of course, people have the freedom to look whatever {{U}}(64) {{/U}} they want. I am just surprised that, given the vast difference between winter and summer temperatures in Connecticut, they can still {{U}}(65) {{/U}} like they are partying on the beach in the middle of February.

单选题Hundreds of buildings were {{U}}wrecked{{/U}} by the earthquake. A. shaken B. damaged C. fallen D. jumped

单选题The rising cost of living is as hard on Ucountry/U families as on city families.

单选题By producing an excess amount of some household articles, a New England colonial family could{{U}} barter{{/U}} with other families.

单选题It's convenient to take bus since buses leave {{U}}at short intervals{{/U}}.

单选题We"re happy to report that business is booming this year.