单选题______ I admit that the problems are difficult, I don't agree that they cannot be solved.A. WhenB. WhereC. WhileD. Why

单选题The article {{U}}sketched{{/U}} the major events of the decade. A.described B.offered C.outlined D.presented

单选题It is nearly impossible to conciliate these two disagreeing parties.

单选题Her speciality is heart surgery. A．region B．site C．field D．platform

单选题 Cell Phones: Hang Up or Keep Talking? Millions of people are using cell phones today. In many places it is actually considered unusual not to use one. In many countries, cell phones are very popular with young people. They find that the phones are more than a means of communication—having a mobile phone shows that they are cool and connected. The explosions around the world in mobile phone use make some health professional worried. Some doctors are concerned that in the future many people may suffer health problems from the use of mobile phones. In England, there has been a serous debate about this issue. Mobile phone companies are worried about the negative publicity of such ideas. They say that there is no proof that mobile phones are bad for your health. On the other hand, why do some medical studies show changes in the brain cells of some people who use mobile phones? Signs of change in the issues of the brain and head can be detected with modern scanning (扫描) equipment, in one case, a traveling salesman had to retire at a young age because of serious memory loss. He couldn't remember even simple tasks. He would often forget the name of his own son. This man used to talk on his mobile phone for about six hours a day, every day of his working week, for a couple of years. His family doctor blamed his mobile phone use, but his employer's doctor didn't agree. What is it that makes mobile phones potentially harmful? The answer is radiation. High-tech machines can detect very small amounts of radiation from mobile phones. Mobile phone companies agree that there is some radiation, but they say the amount is too small to worry about. As the discussion about their safety continues, it appears that it's best to use mobile phones less often. Use your regular phone if you want to talk for a long time. Use your mobile phone only when you really need it. Mobile phones can be very useful and convenient, especially in emergencies. In the future, mobile phones may have a warning label that says they are bad for your health. So for now, it's wise not to use your mobile phone too often.

单选题Better Control of TB Seen if a Faster Cure is Found The World Health Organization estimates that about one-third of all people are infected with bacteria that cause tuberculosis. Most times, the infection remains inactive. But each year about eight million people develop active cases of TB, usually in their (51) . Two million people die (52) it. The disease has (53) with the spread of AIDS and drug-resistant forms of tuberculosis. Current treatments take at least six months. Patients have to (54) a combination of several antibiotic drugs daily. But many people stop (55) they feel better. Doing that can (56) to an infection that resists treatment. Public health experts agree that a faster-acting cure for tuberculosis would be more effective. Now a study estimates just how (57) it might be. A professor of international health at Harvard University led the study. Joshua Salomon says a shorter treatment program would likely mean not just more patients (58) . It would also mean (59) infectious patients who can pass on their infection to others. The researchers developed a mathematical model to examine the effects of a two-month treatment plan. They (60) the model with current TB conditions in Southeast Asia. The scientists found that a two-month treatment could prevent about twenty percent of new cases. And it might (61) about twenty-five percent of TB deaths. The model shows that these (62) would take place between two thousand twelve and two thousand thirty. That is, if a faster cure is developed and in wide use by two thousand twelve. The World Health Organization (63) the DOTS program in nineteen ninety. DOTS is Directly Observed Treatment, Short-course. Health workers watch tuberculosis patients take their daily pills to make (64) they continue treatment. Earlier this year, an international partnership of organizations announced a plan to expand the DOTS program. The ten-year plan also aims to finance research (65) new TB drugs. The four most common drugs used now are more than forty years old. The Global Alliance for TB Drug Development says its long-term goal is a treatment that could work in as few as ten doses.

单选题I must {{U}}compliment{{/U}} you on your handling of a very difficult situation

单选题As soon as we arrived at the campsite, we Uerected/U our tent.

单选题Chicken Soup for the Soul: Comfort Food Fights Loneliness Mashed potatoes, macaroni and cheese, may be bad (51) your arteries, but according to a study in Psychological Science, they're good for your heart and emotions The study focuses on "comfort food" and (52) it makes people feel. "For me personally, food has always (53) a big role in my family, " says Jordan Troisi, a graduate student at the University of Buffalo, and lead author on the study. The study came out of the research program of his co-author Shira Gabriel. It has looked at non-human things (54) may affect human emotions. Some people reduce loneliness (55) bonding with their favorite TV show, (56) virtual relationships with a pop song singer or looking at pictures of loved ones. Troisi and Gabriel wondered if comfort food could have the same effect by making people think of their nearest and dearest. In one experiment, (57) make participants feel lonely, the researchers had them write for six minutes about a fight with (58) close to them. Others were given an emotionally neutral writing assignment. Then, some people in each group wrote about the experience of eating a comfort food and others wrote about eating a new food. (59) , the researchers had participants complete questions about their levels of loneliness. Writing about a fight with a close person made people feel (60) . But people who were generally secure in their relationships would feel less lonely by writing about a comfort food. "We have found that comfort foods are (61) associated with those close to us, " says Troisi. "Thinking about or consuming these foods later then serves as a reminder of those close others. " In their essays (62) comfort food, many people wrote about the experience of eating food with family and friends. In another experiment, eating chicken soup in the lab made people think more about relationships, but (63) they considered chicken soup to be a comfort food. This was a question they had been asked long (64) the experiment, along with many other questions, so they wouldn't remember it. Throughout everyone's daily lives they experience stress, often associated with our connections with others, Troisi says. "Comfort food (65) be an easy remedy for loneliness. /

单选题The poem is {{U}}attributed to{{/U}} one of Emily Dickinson’s.

单选题He described the shape of the pot with a Ucircular/U motion of his hand.

单选题I Will try not to Utake up/U too much of your time.

单选题The entire process is called the greenhouse effect, and most of it is caused by the Uprevalent/U greenhouse gas, water vapor.

单选题The children’s story writer known as Dr. Seuss proved that the simplest stories for children could have characterization and {{U}}suspense.{{/U}}

单选题The poet William Carlos Williams was a New Jersey Uphysician/U.

单选题The parents have to {{U}}restrain{{/U}} their daughter from running out into the street. A. disallow B. reduce C. prevent D. confine

单选题The eight pilot projects funded by $47 million of the Department of Energy's stimulus money are located in different regions of the country from Hawaii to Massachusetts. The department hopes the projects will uncover which devices or systems work best. But again, the question of success could vary depending on the area and its consumers. In rural towns, smart-grid technology may mean creating a system in which homes and businesses receive electricity without interruption. In windy Colorado, a smart grid may focus more on harnessing wind energy to supplant (取代, 代替) electrical power. In rural areas, smart-grid technology focuses onA. creating a system that could be set as an example for all smart grids.B. making use of wind energy to replace electrical power.C. supplying electricity to homes and businesses without interruption.D. the efficiency when transmitting electricity for long distances.

单选题Family History In an age when technology is developing faster than ever before, many people are being 1 to the idea of looking back into the past. One way they can do this is by investigating their own family history. They can try to 2 out more about where their families came from and what they did. This is now a fast-growing hobby, especially in countries with a 3 short history, like Australia and the United States. It is 4 thing to spend some time 5 through a book on family history and to take the 6 to investigate your own family"s past. It is 7 another to carry out the research work successfully. It is easy to set about it in a disorganized way and 8 yourself many problems which could have been 9 with a little forward planning. If your own family stories tell you that you are 10 with a famous character, whether hero or criminal, do not let this idea take over your research. Just 11 it as an interesting possibility. A simple system 12 collecting and storing your information will be adequate to start with; a more complex one may only get in your 13 The most important thing, though, is to 14 started. Who knows what you 15 find?

单选题{{B}}第三篇{{/B}} {{B}} The Exploding Lakes of Cameroon{{/B}} What comes to mind when you think of a lake? You probably imagine a pretty scene with blue water, birds, and fish. For the people in the northwestern Cameroon, however, the image is very different. For them, lakes may mean terrible disasters. In 1984, poisonous gases exploded out of Lake Monoun and came down into the nearby villages, killing thirty-seven people. Two years later, Lake Nyos erupted. A cloud of gases rolled down the hills and into the valleys and killed 1,700 people. Lake Nyos and Lake Monoun are crater (火山口) lakes. They were formed when water collected in the craters of old volcanoes. The volcanoes under Lake Nyos and Lake Monoun are not active anymore. However, poisonous gases from the center of the earth continue to flow up through cracks in the bottom of the lake. This is normal in a crater lake. In most crater lakes, these gases are released often because the water "turns over" regularly. That is, the water from the bottom of the lake rises and mixes with the water at the top, allowing the gases to escape slowly. However, in Lakes Nyos and Monoun, there is no regular turning over. No one knows the reason for this fact, but as a result, these lakes have more gases trapped at the bottom than other crater lakes. In fact, scientists who have studied Lakes Nyos and Monoun have found 16,000 times more gases. When a strong wind, cool weather, a storm, or a landslide (滑坡) causes the water to turn over suddenly, the gases escape in a violent explosion. In the past, no one knew when the gases might explode, so there was no way for the villagers to escape disaster. Now scientists from the United States, France, and Cameroon have found a way to reduce the gas pressure at the bottom of Lake Nyos. They stood a 672-foot plastic pipe in the middle of the lake, with one end of the pipe near the bottom and the other end in the air. Near the top of the pipe, the team put several holes that could be opened or closed by a computer. Now, when the gas pressure gets too high, the holes are opened and some of the gas-filled water shoots up through the pipe into the air like a fountain. With less pressure, a disastrous explosion is much less likely. However, the scientists are not sure that one pipe will be enough to prevent explosions. They hope to put in others soon and they plan to install a similar pipe and a computer system at Lake Monoun as well. To protect people nearby until all of the pipes are in place, the scientists have installed early warning systems at both lakes. If the gas pressure rises to a dangerous level, computers will set off loud sirens (警报) and bright lights to warn the people in the villages. That way, they will have time to escape from the dangerous gases.

单选题 Sharks Perform a Service for Earth's Waters It is hard to get people to think of sharks as anything but a deadly enemy. They are thought to {{U}} {{U}} 1 {{/U}} {{/U}}people frequently. But these fish perform a {{U}} {{U}} 2 {{/U}} {{/U}}service for earth's waters and for human beings. Yet business and sport fishing are threatening their {{U}} {{U}} 3 {{/U}} {{/U}}. Some sharks are at risk of disappearing from {{U}} {{U}} 4 {{/U}} {{/U}}. Warm weather may influence both fish and shark activity. Many fish swim near coastal areas {{U}} {{U}} 5 {{/U}} {{/U}}their warm waters. Experts say sharks may follow the fish into the same areas, {{U}} {{U}} 6 {{/U}} {{/U}}people also swim. In fact, most sharks do not purposely charge at or bite humans. They are thought to mistake a person {{U}} {{U}} 7 {{/U}} {{/U}}a sea animal, such as a seal or sea lion. That is why people should not swim in the ocean when the sun goes down or comes up. Those are the {{U}} {{U}} 8 {{/U}} {{/U}}when sharks are looking for food. Experts also say that bright colors and shiny jewelry may cause sharks to attack. A shark has an extremely good sense of smell. It can find small amounts of substances in water, such as blood, body liquids and {{U}} {{U}} 9 {{/U}} {{/U}}produced by animals. These powerful {{U}} {{U}} 10 {{/U}} {{/U}}help sharks find their food. Sharks eat fish, any {{U}} {{U}} 11 {{/U}} {{/U}}sharks, and plants that live in the ocean. Medical researchers want to learn more about the shark's body defense and immune {{U}} {{U}} 12 {{/U}} {{/U}}against disease. Researchers know that sharks {{U}} {{U}} 13 {{/U}} {{/U}}quickly from injuries. They study the shark in hopes of finding a way to fight human disease. Sharks are important for the world's {{U}} {{U}} 14 {{/U}} {{/U}}. They eat injured and diseased fish. Their hunting activities mean that the numbers of other fish in ocean waters do not become too {{U}} {{U}} 15 {{/U}} {{/U}}. This protects the plants and other forms of life that exist in the oceans.