单选题Our statistics show that we consume all that we are capable of producing.

单选题It is difficult to assess the importance of the decision.

单选题These aretheir motives for doing it.

单选题What do you think would be the {{U}}value{{/U}} of this ring, if I were to sell it?

单选题Pure feldspar is a colorless, transparent mineral, but impurities commonly make it opaque and colorful. A. truly B. rapidly C. periodically D. frequently

单选题 Obesity: the Scourge of the Western World Obesity is rapidly becoming a new scourge of the western world, delegates agreed at the 11th European Conference on the issue in Vienna Wednesday to Saturday. According to statements before the opening of the conference -- of 2,000 specialists from more than 50 countries -- 1.2 billion people worldwide are overweight, and 250 million are obese. Professor Bernhard Ludvik of Vienna General Hospital said, "Obesity is a chronic illness, fin Germany, 20 per cent of the people are already affected, but in Japan only one per cent." But he said that there was hope for sufferers thanks to the new scientific discoveries and medication. Professor Friedrich Hopichler of Salzberg said, "We are living in the new age (but) with the metabolism of a stone-age man." "I have just been to the United States. It is really terrible. A pizza shop is springing up on every corner. We have been overrun by fast food and Coca-Cola-ization. " Many of the experts stressed that obesity was a potential killer. Hopichler said, "Eighty percent of all diabetics are obese, also fifty per cent of all. patients with high blood pressure and fifty per cent with adipose tissue complaints." "Ten per cent more weight means thirteen per cent more risk of heart disease. Reducing one's weight by ten per cent leads to thirteen per cent lower blood pressure." Another expert Hermann Toplak said that the state health services should improve their financing of preventive programs. "Though the health insurance pays for surgery (such as reducing the size of the stomach) when the body-mass index5 is more than 40. That is equivalent to a weight of 116 kilograms for a height of 1.70 meters. One should start earlier." Ludvik said that prevention should begin in school. "Child obesity ( fat deposits) correlates with the time which children spend in front of TV sets." The consequences were only apparent later on. No more than fifteen per cent of obese people lived to the average life expectancy for their population group.

单选题Obesity: the Scourge of the Western World Obesity is rapidly becoming a new scourge of the western world, delegates agreed at the 11th European Conference on the issue in Vienna Wednesday to Saturday. According to statements before the opening of the conference—of 2,000 specialists from more than 50 countries—1.2 billion people worldwide are overweight, and 250 million are obese. Professor Bernhard Ludvik of Vienna General Hospital said: "Obesity is a chronic illness. In Germany, 20 percent of the people are already affected, but in Japan only one percent." But he said that there was hope for sufferers thanks to the new scientific discoveries and medication. Professor Friedrich Hopichler of Salzberg said. "We are living in the new age (but) with the metabolism of a stone-age man." "I have just been to the United States. It is really terrible. A pizza shop is springing up on every corner. We have been overrun by fast food and Coca-Cola-ization." Many of the experts stressed that obesity was a potential killer. Hopichler said: "80 percent of all diabetics are obese, also 50 percent of all patients with high blood pressure and 50 percent with adipose tissue complaints." "10 percent more weight means 13 percent more risk of heart disease. Reducing one"s weight by 10 percent leads to 13 percent lower blood pressure." Another expert Hermann Toplak said that the state health services should improve their financing of preventive programs. "Though the health insurance pays for surgery (such as reducing the size of the stomach) when the body-mass index is more than 40. That is equivalent to a weight of 116 kilograms for a height of 1.70 meters. One should start earlier." Ludvik said that prevention should begin in school. "Child obesity (fat deposits) correlates with the time which children spend in front of TV sets." The consequences were only apparent later on. No more than 15 percent of obese people lived to the average life expectancy for their population group.

单选题{{B}}第三篇{{/B}} {{B}} Relaxation{{/B}} During a state of deep relaxation, several physiological changes take place in the body: the body's oxygen consumption is reduced; the heart heat decreases; muscle tension and sweating ease, and there is decreased sympathetic(交感的) nervous system activity. This restful state not only allows the body to repair and restore itself, but it has a calming effect on the consciousness. How to achieve this state of relaxation, however, is a matter of opinion, and in some medical circles, a matter of controversy(争论). A recent report by Dr. David Holmes of the University of Kansas in the journal "American Psychologist" said that simply sitting in an armchair has just as many beneficial characteristics for the body as meditation(冥想) does. Researchers of other relaxation techniques disagree. These experts believe that more structured techniques, such as meditation, lead to a condition of deep relaxation. The debate goes on, but one thing appears to be clear that the relaxation response can be reached by a number of methods, and the methods themselves are not as important as getting there. One day, one method may work best; on another day, an alternative method may be more appropriate. Once you are aware of all the methods, you can find the one that works best for you. Some of the relaxation techniques are meditation, autoanalysis (自我心理分析) and progressive muscle relaxation. Although these techniques may not, in the end, produce more of a relaxation response than just sitting quietly in a chair, they have the added benefit of structure and discipline, and for these reasons appear to be more effective for most individuals.

单选题 The Ice Age Twenty thousand years ago, the earth was held in control by relentlessly (不宽容地) probing fingers of ice that drew power from frigid strongholds in the north and crept southwestward to bury forests, fields, and mountains. Landscapes that were violated by the slowly moving glaciers(冰川)would carry the scars of this advance far into the future. Temperatures dropped deeply, and land surfaces in many parts of the world were depressed by the unrelenting weight of the thrusting ice. At the same time, so much was drawn from the oceans to form these huge glaciers that sea levels around the world fell by three hundred and fifty feet, and large areas of the continental shelf became dry land. This period of the Earth's history had come to be called the Ice Age. In all, about eleven million square miles of land were covered with ice. The Ice Age terminated about fourteen thousand years ago when the ice sheets began to retreat. It took about seven thousand years for the ice to retreat to its present level.

单选题The attack on Fort Sumter near Charleston provoked a sharp response from the North, which led to the American Civil War.

单选题And the cars are tested for defects before leaving the factory.

单选题He has established himself to be a Ucompetent/U manager by his successfully handling several difficult tasks.

单选题Her novel depicts an ambitious Chinese. A．writes B．sketches C．describes D．indicates

单选题IQ-gene In the angry debate over how much of IQ comes from the genes that children inherit from parents and how much comes from experiences, one little fact gets overlooked: no one has identified any genes (other than those that cause retardation) that affect intelligence. So researchers led by Robert Plomin of London"s Institute of Psychiatry decided to look for some. They figured that if you want to find a "smart gene," you should look in smart kids. They therefore examined the DNA of students like those who are so bright that they take college entrance exams four years early—and still score at Princeton-caliber levels. The scientists found what they sought. "We have," says Plomin, "the first specific gene ever associated with general intelligence." Plomin"s colleagues drew blood from two groups of 51 children each, all 6 to 15 years old and living in six counties around Cleveland. In one group, the average IQ is 103. All the children are white. Isolating the blood cells, the researchers then examined each child"s chromosome 6. Of the 37 landmarks on chromosome 6 that the researchers looked for, one jumped out: a form of gene called IGF2R occurred in twice as many children in the high-IQ group as in the average group—32 percent versus 16 percent. The study, in the May issue of the journal Psychological Science , concludes that it is this form of the IGF2R gene that contributes to intelligence. Some geneticists see major problems with the IQ-gene study. One is the possibility that Plomin"s group fell for "chopsticks fallacy". Geneticists might think they"ve found a gene for chopsticks flexibility, but all they"ve really found is a gene more common in Asians than, say, Africans. Similarly, Plomin"s IQ gene might simply be one that is more common in groups that emphasize academic achievement. "What is the gene that they"ve found reflects ethnicity? "asks geneticist Andrew Feinberg of Johns Hopkins University. " That alone might explain the link to intelligence, since IQ tests are known for being culturally sensitive and affected by a child"s environment." And Neil Risch of Standford University points out that if you look for 37 genes on a chromosome, as the researchers did, and find that one is more common in smarter kids, that might reflect pure chance rather than a causal link between the gene and intelligence. Warns Feinberg: "I would take these findings with a whole box of salt."

单选题Dangerous Sunshine to Children Two United Nations agencies warned on Tuesday that children are most at risk of developing skin cancers as a result of the long-term decline in the earth"s protective ozone layer. The agencies, the World Health Organization (WHO) and the UN Environmental Programme (UNEP), issued the warning as they launched a global programme aimed at alerting schools to the dangers of exposure to the sun. "As ozone depletion becomes more marked, and as people around the world engage more in sun seeking behaviour, the risk of health complications from over-exposure to ultraviolet radiation is becoming a substantial public health concern," said WHO Directorgenera Lee Jong-wook. By reducing the time children and adolescents are exposed to direct sunlight, he said. "We can substantially reduce the risk of contracting skin cancers, cataracts and other conditions which might only appear much later in life." In its 2002 World Health Report, the WHO said around the world an average of 66,000 people died every year from melanoma or other types of skin cancer. Independent scientific research shows that every year there are between two to three million new cases of non-malignant melanoma and around 130,000 malignant—and normally fatal—new full blown skin cancer cases. Although most known skin cancers seemed to occur in the industrialized world, WHO radiation and environmental health specialist Mike Repacholi told a news conference, there were many cases believed to be unreported in poorer countries. Although people with darker skins were less susceptible to skin cancers, they were just as likely to contract eye cataracts as fairer-skinned populations, and people living close to the equator were even more likely to develop them. As for the protection method, the WHO said that under the school plan, dubbed the Inter Sun Project, the two agencies will distribute packages showing teachers how to develop their own sun education programmes, the WHO said. In a joint statement from the two agencies which also marked the International Day for the Preservation of the Ozone Layer, UNEP Executive Director Klaus Toepfer said latest studies showed the protective shield was on the road to recovery. This was the result of international agreements over the past two decades to phase out use of various chemicals—like those used in some pesticides, refrigerators and aerosols. "But we must remain vigilant and more needs to be done before we can say that the problem is solved for good," said Toepfer. This included stopping illegal trade in banned chemicals and enforcing the agreements in developing countries. "Only then can we say that the sky above our heads will be safe for our children and their children to come," the former German environment minister said.

单选题My brother' s plans are very ambitious.A. arbitraryB. aggressiveC. adequateD. abundant

单选题The river Uwidens/U considerably as it begins to turn west.

单选题Firewood is scarce in many parts of the world.A. hard to sellB. easy to makeC. hard to findD. easy to store

单选题Techniques to {{U}}harness{{/U}} the energy of the sun are being developed. A.convert B.store C.utilize D.receive

单选题Going Back to Its Birthplace No sporting event takes hold of the world"s attention and imagination like the Olympic Games. The football World Cup fascinates fans in Europe and South America: the baseball"s World Series is required viewing in North America: the World Table Tennis Championships attracts the most interest in Asia. But the Olympics belong to the whole world. Now, after travelling to 17 countries over 108 years, the Summer Games are returning to Athens, the place where the first modern Olympics was held. Participation in the Games is looked on not only as an achievement, but also as an honor. The 16 days between August 13 and 29 will see a record—202 countries compete, up from Sydney"s 199. Afghanistan is back, having been banned from Sydney because the Taliban government didn"t let women do sports. There is also a place for newcomers East Timer and Kiribati. A total of 10,500 athletes will compete in 28 sports, watched by 53 million ticket-paying viewers as well as a television audience of 4 billion. Athens is to use its rich history and culture to make the Olympics as special as possible. The Games will open with cycling events which start in front of the Parthenon and Acropolis monuments. The final event will be a historic men"s marathon following the original route run by Phidippides in 490 B.C. to bring news of victory over the Persians. The ancient stadium at Olympia, first used for the Games nearly three centuries ago, will stage the shot put competitions. And the Panathenian Stadium, where the first modern Olympics was held, is to host the archery (射箭) events. If the well-known ancient sites deliver a great sense of history to the Games, the 39 new venues add a modern touch to the city of Athens. The main Olympic stadium, with a giant glass and steel roof, is the landmark (标志) building of the Olympics. "We believe that we will organize a "magical" Games," said Athens 2004 President Gianna Angelopoulos Daskalaki. "Our history with the Olympic Games goes back nearly 3,000 years, and Athens 2004 could be the best ever."