单选题Which of the following statements best expresses the main idea of the text?

单选题The latest car model embodies the new research development.

单选题Last year, the crime rate in Chicago has sharply {{U}}dropped{{/U}}. A. declined B. lessened C. descended D. slipped

单选题How a Terrible Battle helped to Change Europe Ninety years ago on a sunny morning in Northern France, something happened that changed Britain and Europe forever. At half past seven on the morning of July 1, 1916, whistles blew and thousands of British soldiers 1 their positions to attack their German enemies. 2 the end of the day, 20, 000 of them were dead, and another 30,000 wounded or missing. The Battle of the Somme, 3 it is called, lasted for six months. When it ended, 125,000 British soldiers were dead. They had gained five kilometers of ground. This was one of a series of great battles during the WWⅠ. The 4 on the Somme was staged to relieve pressure on the French, who were 5 in a great battle of their own at a place called Verdun. By the time the battle ended, over a million French and German troops had been killed. About 17 million people were killed in WWⅠ. There have been wars with greater numbers of dead. But there has never been one 6 most of the dead were concentrated in such a small area. On the Somme battlefield, two men died for every meter of space. Local farmers working in the land still 7 the bodies of those who died in that battle. The dead of all nations were buried in a series of giant graveyards 8 the line of the border between France and Belgium. Relatives and descendants (后代) of those who died still 9 these graveyards today. It took a second great conflict before Europe was to 10 against war itself. Twenty-eight years after the Somme battle, a liberating army of British. American and Canadian troops took 11 France from another German invasion. More than 500,000 people were killed. New graveyards were built. Two great conflicts across two generations helped to change the European 12 about war. Germany, once the most warlike country in Europe, is now probably more in favor of peace than any other. One major 13 of war in Europe was rivalry (竞争) between France and Germany. The European Union was specifically formed to 14 that rivalry. The last British veteran (老兵) of the Somme battle died in 2005, aged 108. And the WWⅠ is passing out of 15 and into history. But for anyone who wants to understand how Europeans think, it is still important to know a little about the terrible events of July 1, 1916.

单选题In Britain and many other countries {{U}}appraisal{{/U}} is now a tool of management-

单选题When I told the manager I didn't have the goods I had ordered delivered on time, he promised to {{U}}investigate{{/U}} my complaint.

单选题America's emphasis on the importance of education for everyone has spurred scientific research.A. encouragedB. endangeredC. endorsedD. enlarged

单选题Where Did All the Ships Go? The Bermuda Triangle is one (51) the greatest mysteries of the sea. In this triangular area between Florida, Puerto Rico and Bermuda in Atlantic, ships and airplanes (52) to disappear more often than in (53) parts of the ocean. And they do so (54) leaving any sign of all accident or any dead bodies. It is (55) that Christopher Columbus was the first person to record strange happenings in the area. His compass stopped working, a flame came down from the sky, and a wave 100 to 200 feet high carried his ship about a mile away. The most famous disappearance in the Bermuda Triangle was the US Naval Air Flight 19. (56) December 5,1945,five bomber planes carrying 14 men, (57) on a training mission from the Florida coast. Later that day, all communications with Flight 19 were lost. They just disappeared without a trace. The next morning,242 planes and 19 ships took part in the largest air-sea search in history. But they found nothing. Some people blame the disappearances (58) supernatural forces. It is suggested the (59) ships and planes were either transported to other times and places, kidnapped by aliens (60) attacked by sea creatures. There are (61) natural explanations ,though. The US Navy says that the Bermuda triangle is one of two places on earth (62) a magnetic compass points towards true north (63) magnetic north. (64) planes and ships can lose their way if they don't make adjustments. The area also has changing weather and is known (65) its high waves. Storms can turn up suddenly and destroy a plane or ship. Fast currents could then sweep away any trace of an accident.

单选题Most Americans find the idea of arranged marriages difficult to understand or accept. They believe that two people should marry for love, after a period of dating or courtship. From their point of view, marriage is the result of mutual attraction and affection rather than practical consideration. In the United States, parents do not arrange marriages for their children. The couple meet independently, either through their academic experience or social contact, without the assistance of a go - between or a matchmaker. How do couples meet in the United States?A. With the assistance of a matchmaker.B. Through academic experience or social contact.C. With the help of their parents.D. Through the arrangement of the families.

单选题Want to Be 100? Listen to These 5 Centenarians(百岁老人) Five neighbors at a central Missouri retirement community who are all centenarians get asked all the time: "How did you live to be 100?" If you want to live to 100 or more, this rare group of five golden girls says the key to longevity (长寿) is working hard at a job you love and taking care of your body while you"re at it. Even though an estimated 70,000 people in the country are currently at the century mark or beyond in age, it is unusual to find five 100-year-olds living in one place. The average life-span(寿命) of Americans is about two or three years short of an 80th birthday party. And most people don"t want to cut out coffee, soda, alcohol, cigarettes, and eat healthy food. "People tell me all the time, "I don"t want to live to be 100,"" said Mildred Leaver, who turned 100 in June. "I think that"s just sad. Aging is attitude and I don"t feel old," said Leaver, a former educator who still drives her Buick around town. It doesn"t take long to see that Leaver and her neighbors Mildred Harris, Grace Wolfson, Gladys Stuart and Viola Semas, have a lot more in common than their longevity and lifelong healthy habits. All are 100 except Stuart, who is 101. Even though their sight and hearing aren"t what they used to be, they"ve all avoided illnesses that many elderly people are stricken with. It"s been 50 years since Leaver beat cancer for the first and only time. The common thread that connects these women is the decades of service to jobs each loved as a farmer, designer, school principal, bookkeeper and secretary. In the early years of their lives, gainfully employed women like them were just as rare as 100-year-old are today.

单选题Democracy {{U}}initially{{/U}} developed in Athens.

单选题How does Organisms Ward off Invaders The livelihood of each species in the vast and intricate assemblage of living things depends on the existence of other organisms. This interdependence is sometimes subtle, some times obvious. Perhaps the most straightforward dependence of one species on another occurs with parasites, organisms that live on or in other living things and derive nutrients directly from them. The parasitic way of life is widespread. A multitude of microorganisms (including viruses and bacteria) and an army of invertebrates or creatures lacking a spinal column (including crustaceans, insects, and many different types of worms) make their livings directly at the expense of other creatures. In the face of this onslaught, living things have evolved a variety of defense mechanisms for protecting their bodies from invasion by other organisms. Certain fungi and even some kinds of bacteria secrete substances known as antibiotics into their external environment. These substances are capable of killing or inhibiting the growth of various kinds of bacteria that also occupy the area, thereby eliminating or reducing the competition for nutrients. The same principle is used in defense against invaders in other groups of organisms. For example, when attacked by disease-causing fungi or bacteria, many kinds of plants produce chemicals that help to ward off the invaders. Members of the animal kingdom have developed a variety of defense mechanisms for dealing with parasites. Although these mechanisms vary considerably, all major groups of animals are capable of detecting and reacting to the presence of "foreign" cells. In fact, throughout the animal kingdom from sponges to certain types of worms shellfish, and all vertebrates (creatures possessing spinal column), there is evidence that transplants of cells or fragments of tissues into an animal are accepted only if they come from genetically compatible or closely related individuals. The ability to distinguish between "self" and "non-self", while present in all animals, is most efficient among vertebrates. which have developed an immune system as their defense mechanism. The immune system recognizes and takes action against foreign invaders and transplanted tissues that are treated as foreign cells.

单选题The Sahara The name Sahara derives from the Arabic word for "desert" or "steppe". At 3.5 million square miles, an area roughly the size of the United States, the Sahara Desert in northern Africa is the largest desert in the world. It spans the continent from the Atlantic Ocean to the Red Sea. Daytime temperatures can reach as high as 130~F. The humidity sometimes gets into the teens. But it can also be as low as 2.5 percent, the lowest in the world. Most of the Sahara receives less than five inches of rain per year, while large areas sometimes have no rainfall at all for years. At the heart of the Sahara is the landlocked north African country of Niger. Here the sand dunes can be 100 feet tall and several miles long. Here sand plains stretch over an area larger than Germany where there is neither water nor towns. Yet sitting in the midst of the surrounding desert is the town of Bilma. Suddenly there are pools of clear water. Surprisingly, there are groves of date palms. Underground water resources, or oases, sufficient to support irrigated agriculture are found in dry stream beds and depressions. Irrigation ditches run off a creek to water fields. Corn, cassava, tea, peanuts, hot peppers, and orange, lime, and grapefruit trees grow in these fields. Donkeys and goats graze on green grass. The Sahara of Niger is still a region where you can see a camel caravan of 500 camels tied together in loose lines as long as a mile, traveling toward such oasis towns. There a caravan will collect life-sustaining salt, which is mined from watery basins, and transport it up to 400 miles back to settlements on the edges of the desert. The round trip across the vast sands takes one month.

单选题It took more than two years to build "The Castle Mall".

单选题The phrase "make room" in the last paragraph could be best replaced by

单选题Her father was a quiet man with graceful manners.

单选题This poem Udepicts/U the beautiful scenery of a small town in the South.

单选题The following may be the reasons why the librarian does not want to help his friend EXCEPT that

单选题Although originally a German innovation, kindergarten got its real start in the United States as a movement to provide an improved learning environment for children.

单选题Nursing-home For an increasing number of students at American universities, old is suddenly in. The reason is obvious: the graying of America means jobs. Coupled with the aging of the baby-boom (生育高峰) generation, a longer life span means that the nation's elderly population is bound to expand significantly over the next 50 years. By 2050, 25 percent of all Americans will be older than 65, up from 14 percent in 1995. The change poses profound questions for government and society, of course. But it also creates career opportunities in medicine and health professions, and in law and business as well. "In addition to the doctors, we're going to need more sociologists, biologists, urban planners and specialized lawyers," says Professor Edward Schneider of the University of Southern California's (USC School of Gerontology, 老年学). Lawyers can specialize in "elder law," which covers everything from trusts and estates to nursing-home abuse and age discrimination. Businessmen see huge opportunities in the elder market because the baby boomers, 74 million strong, are likely to be the wealthiest group of retirees in human history. "Any student who combines an expert knowledge in gerontology with an MBA or law degree will have a license to print money," one professor says. Margarite Santos is a 21-year-old senior at USC. She began college as a biology major but found she was "really bored with bacteria." So she took a class in gerontology and discovered that she liked it. She says, "I did volunteer work in retirement homes and it was very satisfying./