单选题 阅读下面的短文，文中有15处空白，每处空白给出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。 Street sellers particularly in developing countries, supply large amounts of food{{U}} (51) {{/U}}people on low incomes. This sector also employs some 6%～25% of the work force, mainly women, in developing countries, and provides markets for agricultural and other produce. In many countries{{U}} (52) {{/U}}, the authorities are not willing to recognize it{{U}} (53) {{/U}}a formal sector of the food supply system, they may ignore it in food control programs or even try to put an end to{{U}} (54) {{/U}}. There are tow possible contaminants: pathogenic micro-organisms;{{U}} (55) {{/U}}hazardous chemicals: As{{U}} (56) {{/U}}as micro-organisms are concerned, there is apparently no convincing evidence that street foods are more involved in the transmission of infection{{U}} (57) {{/U}}foods obtained in, e. g. hotels. Studies in Egypt and else- where have found street foods to compare not unfavorably with hotel{{U}} (58) {{/U}}in respect of contamination with micro-organisms--some street foods were found to be contaminated with pathogens, but so also were foods from four-and five-star{{U}} (59) {{/U}}in the same area. Hazardous chemicals have{{U}} (60) {{/U}}found in street foods, and food exposed for sale on roadsides may become contaminated by lead from vehicle exhausts. Health dangers may arise{{U}} (61) {{/U}}purchase of raw food of poor quality; improper storage, processing, and cooking, leading to reuse of water; limited piped drinking water; lack{{U}} (62) {{/U}}refrigeration; and unsatisfactory waste-disposal facilities; inexperienced or personal cleanliness. The authorities should take{{U}} (63) {{/U}} account the potentials of different categories of food for transmitting disease, and should control appropriately for the different{{U}} (64) {{/U}}-sellers of bottled drinks require less control than those of food. Dry foodstuff, dried grains, and sugared foods are less likely to transmit disease than gravies, cooked rice, and low-acid milk, egg, and meat products. Similarly foods which are thoroughly cooked and eaten at{{U}} (65) {{/U}} are safer than precooked food kept at high temperatures for several hours.

单选题The police believe theU motiv/U e for the murder was jealousy．

单选题His job was to look after the animals.

单选题Let's {{U}}set{{/U}} up a meeting with other parents, so everyone can learn ways to make water safer for our children to drink.

单选题The Spanish Flu Epidemic If you"re worried about the possibility of a coming bird flu epidemic, you can take comfort in the fact that humanity has survived a similar influenza epidemic in the past. Starting its rounds at the end of World War I, the 1918 flu killed an estimated 50 million people. Popularly known as the Spanish Flu, this type of influenza was far worse than your common cold. Normally, influenza only kills those who are more vulnerable to disease, such as newborns, the old or the sick. However, the Spanish Flu was prone to killing the young and healthy. Often it would disable its victims in hours; within a day, they would be dead, typically from extreme cases of pneumonia(肺炎). The Spanish Flu was quite nasty-fast-spreading and deadly. It managed to spread across the globe, devastating the world. Then suddenly, after two years ravaging(蹂躏)the Earth, it disappeared as quickly as it bad arisen. Despite its nickname, the Spanish Flu did not originate in Spain. Its true origins are unknown. Some believe it started in US forts and then spread to Europe as America joined the war; others think that it populated the trenches of the English and the French and eventually broke out in 1918. Regardless of where it started, eventually a fifth of the world population suffered the disease, with a global mortality rate(死亡率) estimated at 2.5% of the population. Modernity was partly to blame for the quick spread of the disease. It passed throughout the world on trade routes and shipping lines. It hit Northern America, Europe, Asia, Africa and the South Pacific. The war did not help at all—the movement of supplies and troops aided the spread of the Spanish Flu, as well as the trench warfare. Imagine the speed at which a virus can spread in a crowded ditch. The fast emergence of the virus in the trenches caused some soldiers to believe that the Spanish Flu was a new form of biological warfare. Luckily, the Spanish Flu simply vanished by 1920. It is believed the flu simply ran out of fuel to spread.

单选题The government is debating the education laws.

单选题There was a {{U}}simultaneous{{/U}} trial taking place in the next building. A. fair B. full C. public D. coexisting

单选题It is no use {{U}}debating{{/U}} the relative merits of this policy. A. making B. taking C. discussing D. expecting

单选题Fortunately, she managed to finish the work on time.A. HappilyB. LuckilyC. FranklyD. Honestly

单选题We are Urestricted/U to a speed of 30 miles an hour in built-up areas.

单选题The index is the government's chief Ugauae/U of future economic activity.

单选题He believed that this plan could be possibly carried out.A. feasiblyB. favorablyC. successfullyD. totally

单选题Rock climbing is {{U}}hazardous{{/U}}. A. interesting B. dangerous C. attractive D. useful

单选题The industrial revolution modified the whole structure of English society.

单选题The toy boat turned over and sank to the bottom of the pool.A. basisB. groundC. baseD. basement

单选题Blend the sugar, flour, and eggs together.A. bringB. mixC. takeD. buy

单选题The phrase "wary of" in paragraph 8 could be best replaced by

单选题Chronic Diseases: The World"s Leading Killer Chronic diseases are the leading cause of death in the world. Yet health experts say these conditions are often the most preventable. Chronic diseases include heart disease, stroke, cancer, diabetes(糖尿病) and lung disorders. The World Healh Organization says chronic diseases lead to about seventeen million early deaths each year. This United Nations agency expects more than three hundred eighty million people to die of chronic diseases by two thousand fifteen. It says about eighty percent of the deaths will happen in developing nations. The WHO says chronic diseases now cause two-thirds of all deaths in the Asia-Pacific area. In ten years it could be almost three-fourths. People are getting sick in their most economically pro ductive years. In fact, experts say chronic diseases are killing more middle-aged people in poorer countries than in wealthier ones. The WHO estimates that chronic diseases will cost China alone more than five hundred thousand million dollars in the next ten years. That estimate represents the costs of medical treatment and lost productivity. Russia and India are also expected to face huge economic losses. Kim Hak-Su is the head of the United Nations Economic and Social Commission for Asia and the Pacific. Last week in Bangkok he presented a WHO report on the problem. It says deaths from chronic diseases have increased largely as the result of economic gains in many countries. The report details the latest findings from nine countries. They include Brazil, Britain, Canada, China, India and Nigeria. The others are Pakistan, Russia and Tanzania. Mister Kim says infectious and parasitic(寄生的) diseases have until recently been the main killers in Asia and the Pacific. But he says they are no longer the major cause of death in most countries. Health officials say as many as eighty percent of deaths from chronic diseases could be prevented. They say an important tool for governments is to restrict the marketing of alcohol and tobacco to young people. Also, more programs are needed to urge healthy eating and more physical activity. UN officials aim through international action to reduce chronic-disease deaths by two percent each year through two thousand fifteen. They say meeting that target could save thirty-six million lives. That includes twenty-five million in Asia and the Pacific.

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。 {{B}} Changes in Museums{{/B}} Museums have changed. They are no longer places that one "should" visit, they are places to enjoy and learn. At a science museum in Ontario, Canada, you can feel your hair stand on end as harmless electricity passes through your body. At the Metropolitan (大城市的) Museum of Art in New York City, you can look at the seventeenth century instruments while listening to their music. At New York's American Museum of Natural History recently, you can help make a bone-by-hone reproduction of the museum's dinosaur(恐龙), a beast that lived 200 million years age. More and more museum directors are realizing that people learn best when they can somehow become part of what they are seeing. In many science museums, for example, there are no guided tours. The visitor is encouraged to touch, listen, operate, and experiment so as to discover scientific principles for himself. The purpose is not only to provide fun but also to help people feel at home in the world of science. The theory is that people who do not understand science will probably fear it, and those who fear science will not use it to best advantage. One cause of all these changes is the increase in wealth and leisure time. Another cause is the rising percentage of young people in the population. Many of these young people are college students or college graduates. Leon F. Twiggs, a young black professor of art once said, "They see things in a new and different way, They are not satisfied to stand and look at works of art; they want art they can participate(参加) in." The same is true of science and history.

单选题We'll give every teacher space to develop. A. chance B. employment C. room D. opportunity