单选题Have you seen her lately ?

单选题China does a lot of trade with many countries.

单选题High-speed Rail on Track If an agreement signed in Germany works out,travellers of this Asian city may one day be able to zip from the downtown area to its new airport on a train riding a stream of magnetic energy at speeds up to 500 kilometres per hour. The 40-kilometres-trip-now sometimes a long hour journey when the traffic is heavy-could be cut to less than 10 minutes. Such are the goals of a costly project designed to help to "shorten'the distance between the city centre and the suburban busy airport by making it easier and faster to carry travellers to and back from the airport. The mayor of the city and Germany's Thyssen Krupp AG worked out an agreement in Berlin only several days ago that lays the groundwork for the magnetic levitation train line. They signed a commitment to carry out a feasibility study on the project and outlined the city's intention to import German technology. This project,once completed and acceptable to the two business parties, will be a double-win, the German company can benefit from exporting its technology and equipment and the city receiving German technology can improve its traffic and further strengthen its position as a cosmopolis. Called Maglev for short, the system under discussion makes use of a high-speed train levitated above a guideway and propelled by magnetic fields. The project has been in the talking stage for several months. Hans Ueberschaer, German's ambassador visited the city together with Harmut Heine, representative of Thyssen Krupp. They had an initial discussion with the mayor there about the prospect of the project. The talks were believed to be constructive and paved the way for the future talks in Berlin,where a commitment was reached. Sources familiar with the talks estimated that the project would cost US$723 million, which would cover everything from land use fees and rail construction to train cars. Completion date is 2005. A joint venture company is to be established for the project.

单选题She fell overboard and was drowned.

单选题Benjamin Rush established the first free {{U}}dispensary{{/U}} in the United States.

单选题If you want my advice, you should {{U}}revise{{/U}} your plan for the trip to Beijing. A. change B. exchange C. enlarge D. encourage

单选题Not until his play "Beyond the Horizon" was produced was Eugene O'Neill lauded as the foremost creative American playwright.A. compensatedB. secretly namedC. given preferenceD. praised

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。如果该句提供的是正确信息，请选择A；如果该句提供的是错误信息，请选择B；如果该句的信息文章中没有提及，请选择C。 Could you imagine having a cut heal almost overnight(一夜之情)? Scientists at the University of California in San Francisco have isolated(分离) a sub- stance in rabbits that can heal wounds in half the time! The substance, called angiogenesis(血管生成因子) factor, stimulates the growth of blood vessels after injury. Blood vessels are essential to recovery because they carry oxygen and nutrients to cells that both kill germs and repair tissues. All mammals(哺乳动物), from rats to whales to human beings, carry this substance in their bodies. Further research may permit scientists to create artificial angiogenesis factor in the laboratory. Angiogenesis factor, scientists say, would be of value to patients undergoing organ transplants and skin grafts because rapid healing would reduce the time during which infection could strike. The substance could also help "slow healer," such as diabetics, the aged, and the very ill. Cancer researchers are also interested in angiogenesis factor because tumors, like other tissues, depend on blood vessels for growth. Scientists believe that angiogenesis factor may cause this same blood vessel growth in tumors. If antibodies (special body substances that fight disease) against the factor could be found, cancerous tumors could be starved and destroyed.

单选题The train Donald took was

单选题Microcomputer proves itself more and more important in the business, so additional machines are {{U}}purchased{{/U}}.

单选题Compound microscopes have two separate lenses or sets of lenses.

单选题About one quarter of the workers in the country are employed in factories.

单选题I can hardly believe it, it's Uamazing/U.

单选题He maintained that the opinion was wrong.A. emphasizedB. repairedC. heldD. helped

单选题None of the five people killed by inhalational anthrax had been vaccinated against influenza.

单选题The researchers have just completed a study of driving situations.

单选题 Late-Night Drinking Coffee lovers beware. Having a quick "pick-me-up" cup of coffee late in the day will play havoc with your sleep. As well as being a stimulant, caffeine interrupts the flow of melatonin, the brain hormone that sends people into a sleep. Melatonin levels normally start to rise about two hours before bedtime. Levels then peak between 2 a.m. and 4 a.m., before falling again. "It's the neurohormone that controls our sleep and tells our body when to sleep and when to wake," says Manrice Ohayon of the Stanford Sleep Epidemiology Research Center at Stanford University in California. But researchers in Israel have found that caffeinated coffee halves the body's levels of this sleep hormone. Lotan Shilo and a team at the Sapir Medical Center in Tel Aviv University found that six volunteers slept less well after a cup of caffeinated coffee than after drinking the same amount of decal. On average, subjects slept 336 minutes per night after drinking caffeinated coffee, compared with 415 minutes after decal. They also took half an hour to drop off—twice as long as usual—and jigged around in twice as much. In the second phase of the experiment, the researchers woke the volunteers every three hours and asked them to give a urine sample. Shilo measured concentrations of a breakdown product of melatonin. The results suggest that melatonin concentrations in caffeine drinkers were half those in decal drinkers. In a paper accepted for publication in Sleep Medicine, the researchers suggest that caffeine blocks production of the enzyme that drives melatonin production. Because it can take many hours to eliminate caffeine from the body, Ohayon recommends that coffee lovers switch to decal after lunch.

单选题He picked a textbook from the bookshelf and then {{U}}commenced{{/U}} to read.

单选题As they move, glaciers push piles of rocks ahead of them.

单选题John is crazy about pop music.A. madB. sorryC. concernedD. worried