单选题The earth moves around the sun.

单选题I rarely wear a raincoat because I spend most of my time in a car.

单选题Safety officials have earnestly questioned whether the increased use of synthetic materials heightens the risk of fire.

单选题In 1861 it seemed inevitable that the Southern states would break away from the Union.

单选题We are wasting {{U}}precious{{/U}} time sitting around here.

单选题Several international events in the early 1990s seem likely to {{U}}go backwards{{/U}}, or at least weaken, the trends that emerged in the 1980s.

单选题1. Male and Female Pilots Cause Accidents Differently Male pilots flying general aviating(private) aircraft in the United States are more likely to crash due to inattention or flawed decision - making, while female pilots are more likely to crash from mishandling the aircraft. These are the results of a study by researchers at the Johns Hopkins University Bloomberg School of Public Health. The study identifies the differences between male and female pilots in terms of circumstances of the crash and the type of pilots error involved. "Crashes of general aviation aircraft account for 85 percent of all aviation deaths in the United States. The crash rate for male pilots, as for motor vehicle drivers, exceeds that of crashes of female pilots," explains Susan P. Baker. MPH, professor of health policy and management at the Bloomberg School of Public Health. "Because pilot youth and inexperience are established contributors to aviation crashes, we focused on only mature pilots, to determine the gender differences in the reasons for the crash. " The researchers extracted data for this study from a large research project on pilot aging and flight safety. The data were gathered from general aviation crashes of airplanes and helicopters between 1983 and 1997, involving 144 female pilots and 267 reale pilots aged 40 -63. Female pilots were matched with male pilots in a 1 : 2 ratio, by age, classes of medical and pilot certificates, state or area of crash, and year of crash. Then the circumstances of the crashes and the pilot error involved were categorized and coded without knowledge of pilot gender. The researchers found that loss of control on landing or takeoff was the most common circumstance for both sexes, leading to 59 percent of female pilots' crashes and 36 percent of males. Experiencing mechanical failure, running out of fuel, and landing the plane with the landing gear up were among the factors more likely with males ,while stalling(失速) was more likely with females. The majority of the crashes - 95 percent for females and 88 percent for males - involved at least one type of pilot error. Mishandling aircraft kinetics was the most common error for both sexes, but was more common among females( accounting for 81 percent of the crashes)than males (accounting for 48 percent). Males, however, appeared more likely to be guilty of poor decision - making, risk - taking, and inattentiveness, examples of which include misjudging weather and visibility or flying an aircraft with a known defect. Females, though more likely to mishandle or lose control of the aircraft, were generally more careful than their male counterparts.

单选题Dumped waste might contaminate water supplies.

单选题The {{U}}drought{{/U}} destroyed the crops in the Southwest of the United States.

单选题During the past ten years there have been dramatic changes in the international situation.

单选题Humor If you intend using humor in your talk to make people smile, you must know how to identify shared experiences and problems. Your humor must be relevant to the audience and should help to show them that you are one of them or that you understand their situation and are in sympathy with their point of view. Depending on whom you are addressing, the problems will be different. If you are talking to a group of managers, you may refer to the disorganized methods of their secretaries; alternatively if you are addressing secretaries, you may want to comment on their disorganized bosses. Here is an example, which I heard at a nurses" convention, of a story which works well because the audience all shared the same view of doctors. A man arrives in heaven and is being shown around by St.Peter. He sees wonderful accommodations, beautiful gardens, sunny weather, and so on. Everyone is very peaceful, polite and friendly until waiting in a line for lunch, the new arrival is suddenly pushed aside by a man in a white coat, who rushes to the head of the line, grabs his food and stomps over to a table by himself. "Who is that?" the new arrival asked St.Peter. "Oh, that"s God" came the reply, "but sometimes he thinks he"s a doctor." If you are a part of the group which you are addressing, you will be in a position to know the experiences and problems which are common to all of you and it"ll be appropriate for you to make a passing remark about the inedible canteen food or the chairman"s notorious bad taste in ties. With other audiences you mustn"t attempt to cut in with humor as they will resent an outsider making disparaging remarks about their canteen or their chairman. You will be on safer ground if you stick to scapegoats like the Post Office or the telephone system. If you feel awkward being humorous, you must practice so that it becomes more natural. Include a few casual and apparently off-the-cuff remarks which you can deliver in a relaxed and unforced manner. Often it"s the delivery which causes the audience to smile, so speak slowly and remember that a raised eyebrow or an unbelieving look may help to show that you are making a light-hearted remark. Look for the humor. It often comes from the unexpected. A twist on a familiar quote "If at first you don"t succeed, give up" or a play on words or on a situation. Search for exaggeration and understatement. Look at your talk and pick out a few words or sentences which you can turn about and inject with humor.

单选题He had an increasingly {{U}}uneasy{{/U}} feeling about his answer to the question.

单选题For some obscure reason, the simple game is becoming very popular.A. unclearB. obviousC. majorD. minor

单选题2. The Roots of Genea logy Genealogy(家系学) ,the study of family history, is the second most popular hobby in America today. Millions of Americans spend their free time trying to trace their family lines, some reaching as far back as a thousand years. This interest in family history is not new. Many people remember their ancestors and honor them by passing on family names or keeping their stories alive. In fact, as a country, America showed its first real interest in genealogy in the 1890s. At this time, organizations such as the Daughters of the American Revolution were created to connect people with ancestors who played a part in early American history. But America's interest in genealogy has grown over the past few decades, largely for two reasons. One of the causes of genealogy's most recent growth in popularity might be Alex Haley's book Roots ,which follows one man's family through slavery and all the way back to 18th century Africa. In one year, more than one million copies of the book were sold. In 1977 ,Roots was made into a television miniseries, which was watched by approximately 130 million people. At the time, that was the biggest audience any television program had ever had. People not only enjoyed the story of Roots, but also were interested in the idea that one man could learn so much about his family's history. The idea that a man living in America in the twentieth century might have a direct link to important moments in history inspired many Americans to do their own genealogical studies and trace their own threads in the fabric of world history. The Internet has also contributed to the enormous popularity of genealogy today because it is so convenient and vast. Before the Internet, people had to go to libraries and public records facilities to find information about their ancestors. But now, with a computer, anyone can access thousands of genealogy websites. While many of these websites contain useful information and resources, the Internet also provides people with the opportunity to meet hundreds, even thousands of other genealogists. Occasionally, genealogists even meet distant members of their own families and are able to share valuable research with each other.

单选题Lower taxes would {{U}}spur{{/U}} investment and help economic growth．

单选题请根据短文内容为每处空白确定1个最佳选项。 　　　　　　　　　　　　　　　　　　　　{{B}}New Ideas{{/B}} Iceland's President Olafur Grimsson is trying to drive carbon dioxide (二氧化碳) underground to {{U}}(51) {{/U}} its release into the air. Over the next two years, a team of scientists will try to {{U}} (52) {{/U}} carbon dioxide—charged water into the rock underground. Scientists say this should work. The CO2 will react with the rock to form a stable mineral that remains in the {{U}}(53) {{/U}} for millions of years. If the experiment succeeds, Iceland could give the world a new {{U}}(54) {{/U}} to reduce emissions. Sigurdur Gislason, a university professor in Iceland, says his country has an {{U}}(55) {{/U}} over other countries. "We have enormous amounts of clean {{U}}(56) {{/U}} and a small society. You can do experiments here that you can't do anywhere else." In an attempt to cut back on the use of air conditioners during summer, the Japanese government in2005 {{U}}(57) {{/U}} a campaign to keep office temperatures at 28℃ in summer. Men were also encouraged to change business suits for {{U}}(58) {{/U}} wear. In other words, no more ties. "The {{U}}(59) {{/U}} is meant to show the government's resolve to achieve Japan's target of reducing greenhouse (温室) gas emissions by 6 percent," said Chief Cabinet Secretary Hiroyuki Hosoda. The {{U}}(60) {{/U}} has cut an estimated 79,000 tons of carbon dioxide gas emissions each year. As the country's 2005 Energy Policy Act {{U}}(61) {{/U}} into force this year, more Americans will be encouraged to use {{U}}(62) {{/U}} cars and energy sources. According to the new law, those who buy hybrid (混合) cars such as the Toyota Prius can earn tax credits, or rebates (退款),of {{U}}(63) {{/U}} to ＄2,600 a year. Homemakers (主妇) can also save when they renovate, claiming tax rebates {{U}}(64) {{/U}} around ＄500 simply by fitting their homes with energy—saving insulation (绝缘). If they {{U}}(65) {{/U}} in solar water heating, the payoff at tax time is equal to 30 percent of the appliance's cost or a maximum of ＄2,000.

单选题The food is insufficient for three people. A. scarce B. short C. marginal D. inadequate

单选题When she was invited to the party, she readily accepted.

单选题Put some effort into your work

单选题Jane said that she couldn"t tolerate the long hours.