单选题 Stem Cell Therapy May Help Repair the Heart According to scientists in the USA, stem cell therapy may one day be able to repair the hearts of people with heart failure. Researchers at Pittsburgh University School of Medicine examined 20 patients who had severe heart failure and were going to have surgery. They injected stem cells into the parts of their hearts that were damaged. They then compared their hearts with those of people who had undergone surgery without having the stem cells injected into them (they had also suffered from severe heart failure). The patients who had the stem cells injected had hearts that were able to pump (用泵抽运) more blood than the others. According to Professor Robert Kormos, one of the researchers, these results could revolutionize heart treatment. Although previous studies had indicated that there might be a benefit, this is the first study that has actually proved that stem cell therapy can help the failing heart work better. All the patients in this study had hearts that could not pump blood properly. The scientists measured their ejection fraction (射血分数). It is a measure of heart performance; you measure how much blood is being pumped out by the left ventricle (心室). Healthy people's ejection fraction is about 55%. These patients had ejection fraction of under 35%. They all had by-pass surgery (搭桥手术) performed on them. Some of the patients had stem cells taken from their hip bones and injected into 25-30 sites in the damaged heart muscle. Six months later their ejection fraction rate was 46.1% while those who just had surgery but no stem cell injections averaged 37.2%. No side effects were reposed. Heart failure is a common problem all over the world. In the UK alone about 650,000 people suffer from heart failure every year. As the number of people suffering from heart failure increases in the world in general these findings are particularly significant. Current treatments relieve the symptoms. This new stem cell therapy actually repairs the damaged muscle in the heart and has the potential of curing the disease.

单选题The promised wage increase is being held back while it is examined by the government to see if it is greater than the law allows.

单选题Changes of Women's Role The role of women in Britain has changed a lot in this century, (51) in the last twenty years. The main change has been (52) giving women greater equality with men. Up to the beginning of this century, women seem to have trod (53) rights. They could not vote and were kept at home. (54) , as far as we know, most women were happy with this situation. Today, women in Britain certainly (55) more rights than they used to. They were (56) the vote in 1919. In 1970 a law was passed to give them an equal (57) of wealth in the case of divorce, (58) the Equal Pay Act gave them the right of equal pay with men for work of equal value in the same year. Yet (59) these changes, there are still great difference in status between men and women. Many employers seem to (60) the Equal Pay Act, and the average working women is (61) to earn only about half that a man earns for the same job. (62) a survey, at present, only one-third of the country's workers are (63) women. This small percentage is partly (64) a shortage of nurseries. If there were (65) nurseries, twice as many women might well go out to work.

单选题It"s a gorgeous day anyway.

单选题Although nobody {{U}}acknowledged{{/U}} his presence, Mr. Smith knew he had been recognized.

单选题She"s been deliberately ignoring him all day.

单选题{{B}}第二篇{{/B}} One-room schools are part of the heritage of the United States，and the mention of them makes people feel a longing for“the way things were．”One room schools are an endangered species(种类)，however．For more than a hundred years，one-room schools have been systematically shut down and their students sent away to centralized schools．As recently as 1930 there were 149，000 one-room schools in the United States．By 1970 there were 1，800．Today，of the nearly 800 remaining one-room schools，more than 350 are in Nebraska．The rest are spread through a few other states that have on their roadmaps wide-open spaces between towns． Now that there are hardly any left，educators are beginning to think that maybe there is something yet to be learned from one-room schools，something that served the pioneers that might serve as well today．Progressive educators have come up with new names like“peer-group teaching”and“multi-age grouping”for educational procedures that Occur naturally in the one-room schools．In a one-room school the children teach each other because the teacher is busy part of the time teaching someone else．A fourth grader can work at a fifth-grade level in math and a third-grade level in English without the bad name associated with being left back or the pressures of being skipped(超过)ahead．A youngster with a learning disability can find his or her own level without being separated from the other pupils．A few hours in a small school that has only one classroom and it becomes clear why so many parents feel that one of the advantages of living in Nebraska is that their children have to go to a one-room school．

单选题We reckoned there was only one man who is fit for the post.

单选题We're happy to {{U}}collaborate{{/U}} with you in the project. A. compete B. cooperate C. coordinate D. contend

单选题The teachers want to do away with cheating in their school.A. do credit toB. retainC. put an end toD. substitute for

单选题He is hesitating whether to quit the competition because of illness.A. give upB. put upC. set upD. take up

单选题The walrus uses its tusks to dig food from the ocean bottom.A. floorB. environmentC. islandsD. waves

单选题Human Space Exploration While scientists are searching the cause of the Columbia disaster, NASA is moving ahead with plans to develop a new craft that would replace shuttles (航天飞机) on space station missions by 2012 and respond quickly to space station emergencies. The space agency released the first set of mission needs and requirements several days ago for me orbital space plane (轨道航天飞机), which would be designed to transport a crew of four to and from the International Space Station. Although it includes few specifics, the plan states the orbiter (轨道航天飞机) will be safer cheaper and require less preparation time than the shuttle. It would be able to transport four crew members by 2012 though it would be available for rescue missions by 2010. NASA says the craft should be able to transport injured or ill space station crew members to "definitive (决定性的) medical care" within 24 hours. The release of the requirements showed NASA remains focused on the long-term priorities of space exploration, even as questions exist concerning the loss of Columbia and its seven member crew on February 1, 2003. Expels at Marshall Space Flight Center in Huntsville, Alabama, have been working for years on a successor to the shuttle. The project, known as the Space Launch Initiative (倡议), was divided last year into two parts one focusing on a future launch vehicle, the other on a space station orbiter. The orbiter is expected to be ready sooner. The program's managers say NASA officials have told them not to alter Space Launch Initiative in light of the Columbia disaster. U.S. President George W. Bush asked Congress for about US$1 billion for Space Launch Initiative in 2004, funds that would be almost equally split between the Orbital Space Plane and Next Generation Launch Technology.

单选题A Pay Rise or Not? "Unless I get a rise, I"ll have a talk with the boss, Henry Manley," George Strong said to himself. George liked his job and he liked the town he lived in, but his wife kept telling him that his pay was not enough to meet the needs of the family. That was why he was thinking of taking a job in Birmingham, a nearby city about 50 miles away. He had been offered a job in a factory there, and the pay was far better. George lived in Wyeford, a medium-sized town. He really liked the place and didn"t like the idea of moving somewhere else, but if he took the job in Birmingham, he would have to move his family there. Henry Manley was the manager of a small company manufacturing electric motors. The company was in deep trouble because, among other reasons, the Japanese were selling such things at very low prices. As a result, Manley had to cut his own prices and profits as well. Otherwise he would not get any orders at all. Even then, orders were still not coming in fast enough, so that there was no money for raises (加工资) for his workers. Somehow, he had to struggle along and keep his best workers as well. He sighed. Just then the phone rang. His secretary told him that George Strong wanted to see him as soon as possible. Manley sighed again. He could guess what it was about. George Strong was a very young engineer. The company had no future unless it could attract and keep men like him. Manley rubbed his forehead (前额); his problems seemed endless.

单选题We usually choose to play PC games as an amusement.

单选题A Country"s Standard of Living The "standard of living" of any country means the average person"s share of the goods and services the country produces. A country"s standard of living, therefore 1 first on its capacity to produce wealth. "Wealth" in this 2 is not money, for we do not live on money but on things that money can buy: "goods" such as food and clothing, and "services" such as transport and entertainment. A country"s capacity to 3 wealth depends upon many factors, most of 4 have an effect on one another. Wealth depends 5 a great extent upon a country"s natural resources. Some regions of the world are well supplied with coal and minerals, and have fertile (肥沃的) soil and a favorable climate; other regions 6 none of them. Next to natural resources comes the ability to 7 them to use. China is perhaps as rich as the USA in natural resources, but suffered for many years 8 civil and external wars, and for this and other 9 was unable to develop her resources. Sound and stable political conditions, and 10 from foreign invasions, enable a country to develop its natural resources peacefully and steadily, and to produce more 11 than another country equally well favored by nature but less well ordered. A country"s standard of living does not only depend upon the wealth that is produced and 12 within its own borders, but also upon what is directly produced through international trade for mple, Britain"s wealth in foodstuffs and other agricultural 13 would be much less if she had to depend only on those grown at home. Trade makes it possible for the surplus (过剩的) manufactured goods to be traded abroad for the agricultural products 14 would otherwise be lacking. A country"s wealth is, therefore, much influenced by its manufacturing capacity. 15 that other countries can be found ready to accept its manufactures.

单选题Mary said {{U}}mildly{{/U}}， that she was just curious

单选题Let"s postulate that she is a lawyer, then what"s her opinion about it?______

单选题Even in a highly modernized country, manual work is still needed.

单选题There is no risk to public health.A. pointB. dangerC. chanceD. hope