单选题 The Sea What do you know about the sea? We know that it looks very pretty when the sun is shining on it. We also know that it can be very rough when there is a strong wind. What other things do we know about it? The first thing to remember is that the sea is very big. When you look at the map of the world you will find there is more water than land. The sea covers three quarters of the world. The sea is also very deep in some places. It is not deep everywhere. Some parts of the sea are very shallow. But in some places the depth of the sea is very great. There is one spot, near Japan, where the sea is nearly 11 kilometers deep! The highest mountain in the world is about 9 kilometers high. If that mountain were put into the sea at that place, there would be 2 kilometers of water above it! What a deep place! If you have swum in the sea, you know that it is salty. You can taste the salt. Rivers, which flow into the sea, carry salt from the land into the sea. Some parts of the sea are saltier than other parts. There is one sea, called the Dead Sea, which is very salty. It is so salty that swimmers cannot sink! Fish cannot live in the Dead Sea! In most parts of the sea, there are plenty of fishes and plants. Some live near the top of the sea. Others live deep down. There are also millions of tiny living things that float in the sea. These floating things are so small that it is hard to see them. Many fish live by eating these. The sea can be very cold. Divers who go deep down in the sea, know this. On the top the water may be warm. When the diver goes downwards, the sea becomes colder and colder. Another thing happens. When the diver goes deeper, the water above presses down on him. It squeezes him. Then the diver has to wear clothes made of metal. But he cannot go very deep. Some people who wanted to go very deep used a very strong diving ship! They went down to the deepest part of the sea in it. They went down to a depth of eleven kilometers!

单选题It"s prudent to start any exercise program gradually at first.

单选题Michael is now merely a good friend.

单选题He always did well at school in spite of taking a part - time jobs.A. despiteB. regardless ofC. on account ofD. in case of

单选题The expression "adding vital life to years" in the last paragraph means

单选题Smoking Can Increase Depressive Symptoms in Teens While some teenagers may puff on cigarettes to "self-medicate" against the blues, scientists at the University of Toronto and the University of Montreal have found that smoking may actually (51) depressive symptoms in some teens. "This observational study is one of the few to examine the perceived (52) benefits of smoking among teens," says lead researcher Michael Chaiton, a research associate at the Ontario Tobacco Research Unit of the University of Toronto. " (53) cigarettes may appear to have self-medicating (54) or to improve mood, in the long term we found that teens who started to smoke reported higher depressive symptoms." As part of the study, some 662 high school teenagers completed up to 20 questionnaires (55) their use of cigarettes to affect mood. Secondary schools were selected to provide a mix of French and English participants, urban and rural schools, and schools (56) in high, moderate and low socio-economic neighbourhoods. Participants were divided into three (57) : never smokers; smokers who did not use cigarettes to self-medicate, improve mood or physical (58) ; smokers who used cigarettes to self-medicate. Depressive symptoms were measured using a scale that asked how felt too fired to do things: had (59) going to sleep or staying (60) ; felt unhappy, sad, or depressed; felt hopeless about the future; felt vexed, antsy or tense; and worried too much about things. "Smokers who used cigarettes as mood (61) had higher risks of elevated depressive symptoms than teens who had never smoked," says co-researcher Jennifer O'Loughlin, a professor at the University of Montreal Department of Social and Preventive Medicine. "Our study found that teen smokers who reported emotional benefits from smoking are at higher risk of (62) depressive symptoms." The (63) between depression and smoking exists (64) among teens that use cigarettes to feel better. "It's (65) to emphasize that depressive symptom scores were higher among teenagers who reported emotional benefits from smoking after they began to smoke," says Dr. Chaiton.

单选题下面有3篇短文，每篇短文后有5道题，每道题后面有4个选项。请仔细阅读短文并根据短文内容回答其后面的问题，从4个选项中选择1最佳答案。{{B}}第一篇{{/B}} {{B}} The Gene Industry{{/B}} Major companies and already in pursuit of commercial applications of the new biology. They dream of placing enzymes in the automobile to monitor exhaust and send data on pollution to a microprocessor that will then adjust the engine. They speak of what the New York Times calls "metal-hungry microbes that might be used to mine valuable trace metals from ocean water". They have already demanded and won the right to patent new life forms. Nervous critics, including many scientists, worry that there is corporate, national, international, and inter-scientific rivalry in the entire biotechnological field. They create images not of oil spills, but of "microbe spills" that could spread disease and destroy entire populations. The creation and accidental release of extremely poisonous microbes, however, is only one cause for alarm. Completely rational and respectable scientists are talking about possibilities that stagger the imagination. Should we breed people with cow-like stomachs so they can digest grass and hay, thereby relieving the food problem by modifying us to eat lower down on the food chain? Should we biologically alter workers to fit the job requirement, for example, creating pilots with faster reaction times or assembly-line workers designed to do our monotonous work for us? Should we attempt to eliminate "inferior" people and breed a" super-race"? (Hitler tried this, but without the genetic weaponry that may soon issue from our laboratories.) Should we produce soldiers to do our fighting? Should we use genetic forecasting to pre-eliminate "unfit" babies? Should we grow reserve organs for ourselves, each of us having, as it were, a "savings bank" full of spare kidney, livers or hands? Wild as these notions may sound, every one has its advocates (and opposers) in the scientific community as well as its striking commercial application. As two critics of genetic engineering, Jeremy Rifkin and Ted Howard, state in their book Who Should Play God? "Broad Scale genetic engineering will probably be introduced to America much the same way as assembly lines, automobiles, vaccines, computers and all the other technologies. As each new genetic advance becomes commercially practical, a new consumer need will be exploited and a market for the new technology will be created."

单选题The price of vegetables fluctuates according to the weather.

单选题Hospital Mistreatment According to a study, most medical interns report experiencing mistreatment, including humiliation by senior doctors, (51) threatened, or physical abuse in their first year out of medical school. The findings come from analysis of the (52) a 13-page survey mailed in January 1991 to 1,733 second-year residents. The survey and (53) appear in the April 15th issue of the Journal of the American Medical Association. Overall, out of the 1,277 residents (54) completed surveys, 1,185 said that they had experienced at least one incident of mistreatment in their intern year. (55) reporting incidents where they were abused, more than 45% of the residents said they had witnessed at least one incident where other persons (56) false medical records. Moreover, nearly three quarters of the residents said they had witnessed mistreatment of patents by other residents, attending physicians, or nurses. Almost 40% said patient mistreatment was a frequent (57) More than 10% of the residents said they experenced some type of sexual harassment or discrimination, verbal abuse was the most common problem cited. When abusive incidents were limited to events occurring three or more times, 53% of the respondents reported that they (62) belittled or humiliated by more senior residents, while just over 21% reported someone taking credit for their work. Being " (63) tasks for punishment," "being pushed, kicked or hit," and (64) someone "threatening your reputation or career," were reported as a more (65) occurrence by over 10% of the responding residents.

单选题 阅读下面的短文，文中有15处空白，每处空白给出了4个选项，请根据短文的内容从4个选项中选择1个最佳答案。 {{B}} Highways in the US{{/B}} The United States is well-known for its network of major highways designed to help a driver get from one place to another in the shortest possible time. {{U}}(51) {{/U}} these wide modern roads are generally smooth and well maintained, with {{U}}(52) {{/U}} sharp curves and many straight sections, a direct route is not always the most {{U}}(53) {{/U}} one. Large highways often pass {{U}}(54) {{/U}} scenic areas and interesting small towns. Furthermore, these highways generally {{U}}(55) {{/U}} large urban centers which means that they become crowded with {{U}}(56) {{/U}} traffic during rush hours, when the "fast, direct" way becomes a very slow route. However, there is {{U}}(57) {{/U}} always another route to take if you are not in a hurry. Not far from the {{U}}(58) {{/U}} new "superhighways", there are often older, {{U}}(59) {{/U}} heavily traveled roads which go though the countryside. {{U}}(60) {{/U}} of these are good two lane roads; others are uneven roads {{U}}(61) {{/U}} through the country. These secondary routes may go up steep slopes along hilly {{U}}(62) {{/U}} or down frightening hillsides to towns {{U}}(63) {{/U}} in deep valleys. Though these are less direct routes, longer and slower, they generally go to places {{U}}(64) {{/U}} the air is clean and the scenery is beautiful, and the driver may have a chance to get a fresh, clean {{U}}(65) {{/U}} of the world.

单选题We shall keep the money in a secure place.

单选题The risk of strange behaviors resulting from taking sleeping pills could be reduced it

单选题Niagara Falls is a great tourist {{U}}site{{/U}}, drawing millions of visitors every year.

单选题He {{U}}accidentally{{/U}} found a stock of jewelry stamps when he was packing up his books.

单选题Class sizes will increase under the new scheme .

单选题I don't quite {{U}}follow{{/U}} what she is saying．

单选题Her treatment of the subject is {{U}}exhaustive{{/U}}. A. boring B. thorough C. interesting D. touching

单选题I was amazed at the beauty of the mountain when I reached the top.A. excitedB. astonishedC. happyD. shocked

单选题One-room schoolhouses can still be found in isolated areas of North America. A. bare B. deprived C. remote D. developed

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。 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.