单选题Questions 18-21 are based on the following passage.

单选题Directions: Read the following text. Answer the questions on each text by choosing A, B, C or D. Standing on the rim of the Grand Canyon, gazing across this giant wound in the Earth's surface, a visitor might assume that the canyon had been caused by some ancient convulsion (剧烈震动). In fact, the events that produced the canyon, far from being sudden and cataclysmic (剧变的), simply add up to the slow and orderly process of erosion. Many millions of years ago, the Colorado Plateau (高原) in the Grand Canyon area contained 10,000 more feet of rock than it does today and was relatively level. The additional material consisted of some 14 layered formations of rock. In the Grand Canyon region these layers were largely worn away over the course of millions of years. Approximately 65 million years ago the plateau's flat surface in the Grand Canyon area bulged upward from internal pressure; geologists refer to this bulging action as upwarping; it was followed by a general elevation of the whole Colorado Plateau, a process that is still going on. As the plateau gradually rose, shallow rivers that meandered (蜿蜒而流) across it began to run more swiftly and cut more definite courses. One of these rivers, located east of the upwarp, was the ancestor of the Colorado. Another river system called the Hualapai, flowing west of the upwarp, extended itself eastward by cutting back into the upwarp; it eventually connected with the ancient Colorado and captured its waters. The new river then began to carve out the 277-mile-long trench that eventually became the Grand Canyon. Geologists estimate that this initial cutting action began no earlier than 10 million years ago. Since then, the canyon forming has been cumulative. To the corrosive force of the river itself has been added other factors. Heat and cold, rain and snow, along with the varying resistance of the rocks, increase the opportunities for erosion. The canyon rainfall running off the high plateau creates feeder streams that carve side canyons. Pushing slowly backward into the plateau, the side canyons expose new rocks, and the pattern of erosion continues.

单选题From her wheelchair, a child raises rounded arms above her head to form a blossoming flower. Nearby, a blind boy gently waves a flowing scarf as his body sways back and forth. Welcome to Infinite Dreams, a southern California program that each year helps more than 1,000 children with disabilities learn ballet, jazz, and other forms of movement. For founder Zina Bethune, a professional dancer and actress who works with a team of six instructors, this is a deeply felt mission. "I've walked a very fine line between the abled and disabled worlds all' my life," says Bethune, a former soloist with the New York City Ballet who starred on Broadway in Tommy Tune's production of Grand Hotel. Born and raised in New York City, Bethune, 47, started formal ballet training at age 6 with legendary choreographer George Balanchine. But during adolescence, a host of medical problems mined her chances of becoming a prima ballerina. But she ignored them and her pain and continued to dance. Faced with all sorts of difficulties, she never gave up. By the time she was 34, Bethune had went gone two hip replacements. Bethune, who has been married for 18 years to a former dancer, started Infinite Dreams in southern California in 1983. "Dance is spiritual," she says. "And these children's spirits are not disabled." Funded through grants and private donations, the group offers hour-long weekly sessions in schools and performs at arts festivals throughout the year. "Participation, not perfection, is emphasized," notes Bethune, who is currently trying to make her program available nationally. Adjustments to the dance steps are made as needed. Russell Bartel, 14, a star student with spina bifida and little feeling in his lower legs, pirouettes not by turning on his toes but by spinning on his back. "What we try to make clear," Bethune says, "is that their individual version of any step is valid. That's their dance." From that understanding often springs a newfound sense of confidence. "I can do a lot more than I ever thought I could." Bartel says. "It makes me feel great./

单选题As far as maintaining the peace was concerned, conditions in 1977 were comparatively______.

单选题Helen

单选题Onwhatdayoftheweekwillthemagazinearrive?A.Monday.B.Tuesday.C.Wednesday.D.Thursday.

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单选题What is the real cause of the potential water crisis?

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单选题WhenwasKingborn?

单选题Technology has been an encouragement of historical change. It acted as such a force in Eng land beginning in the eighteenth century, and across the entire Western World in the nineteenth. Rapid advances were made in the use of scientific findings in the manufacture (制造) of goods, which has changed ideas about work. One of the first changes was that other forms of energy have taken the place of human power. Along with this came the increased use of machines to manufacture products in less time. People also developed machines that could produce the same parts for a product: each nail was exactly like every other nail, meaning that each nail could be changed for every other nail. This means that goods could be mass produced, though mass production required breaking production down into smaller and smaller tasks. Once this was done, workers no longer started on the product and labored to complete it. In stead, they might work only one thousandth of it, other workers completing their own parts in certain order. There is nothing strange about this manufacturing work by today's standards. Highly skilled workers were unable to compare with the new production techniques, as mass production al lowed goods of high standard to be produced in greater number than could ever be done by hand. But the skilled worker wasn't the only loser, the common workers lost too. Similar changes forced farmers away. The increased mechanization(机械化) of agriculture freed masses of workers from ploughing the land and harvesting its crops. They had little choice but to stream toward the rapidly developing industrial centers. Increasingly, standards were set by machines. Workers no longer owned their own tools, their skill was no longer valued, and pride in their work was no longer possible. Workers fed, looked after and repaired the machines t hat could work faster than humans at greatly reduced cost.

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单选题Questions 14-17 are based on a dialogue between two friends about their weekend.

单选题Whatdoesthewomanmean?A.Sheinvitesthemantoapotlucknextweekend.B.Sheasksthemantohelpherwiththegardening.C.Sheisnotfreetoday.D.SheagreestomeetthemannextSaturday.