单选题Cindy: Thanks for all your help.Joe: No problem. Have a good day!Cindy: ______ Thanks again. Bye.

单选题此题为音频题

单选题 The fertile land of the Nile delta is being eroded along Egypt's Mediterranean coast at an astounding rate, in some parts estimated at 100metres per year. In the past, land scoured away from the coastline by the currents of the Mediterranean Sea used to be replaced by sediment brought dawn to the delta by the River Nile, but this is no longer happening. Up to now, people have blamed this loss of delta land on the two large dams at Aswan in the south of Egypt, which hold back virtually all of the sediment that used to flow down the river. Before the dams were built, and the Nile flowed freely, carrying huge quantities of sediment north from Africa's interior to be deposited on the Nile delta. This continued for 7,000 years, eventually covering a region of over 22,000 square kilometres with layers of fertile silt. Annual flooding brought in new, nutrient-rich soil to the delta region, replacing what had been washed away by the sea, and dispensing with the need for fertilizers in Egypt's richest food-growing area. But when the Aswan dams were constructed in the 20th century to provide electricity and irrigation, and to protect the huge population centre of Cairo and its surrounding areas from annual flooding and drought, most of the sediment with its natural fertilizer accumulated up above the dam in the southern, upstream half of Lake Nasser, instead of passing down to the delta. Now, however, there turns out to be more to the story. It appears that the sediment-free water emerging from the Aswan dams picks up silt and sand as it erodes the river bed and banks on the 800-kilometre trip to Cairo. Daniel Jean Stanley of the Smithsonian Institute noticed that water samples taken in Cairo, just before the river enters the delta, indicated that the river sometimes carries more than 850 grams of sediment per cubic metre of water—almost half of what it carried before the dams were built. 'I'm ashamed to say that the significance of this didn't strike me until I had read 50 or 60 studies,' says Stanley in Marine Geology. 'There is still a lot of sediment coming into the delta, but virtually no sediment comes out into the Mediterranean to replenish the Coastline. So this sediment must be trapped on the delta itself.' According to Siegel, international environmental organizations are beginning to pay closer attention to the region, partly because of the problems of erosion and pollution of the Nile delta, but principally because they fear the impact this situation could have on the whole Mediterranean coastal ecosystem. But there are no easy solutions. In the immediate future, Stanley believes that one solution would be to make artificial floods to flush out the delta waterways, in the same way that natural floods did before the construction of the dams. He says, however, that in the long term an alternative process such as desalination may have to be used to increase the amount of water available, 'In my view, Egypt must devise a way to have more water running through the river and the delta,' says Stanley. Easier said than done in a desert region with a rapidly growing population.

单选题Crew chiefs supervised engines, switches and lights that told them how each item of equipment was functioning. A. observed B. preserved C. monitored D. nurtured

单选题There are two major problems linked with atomic power plants, ______ the first concerns nuclear waste.

单选题During their first teacher training year, the students often visited schools for the ______ of lessons.

单选题We wish that you ______ such a lot of work, bemuse we know that you would have enjoyed the concert.

单选题Steve looked at the envelope and recognized Jenny’S handwriting_________ .

单选题I would rather I ______ her three years ago.

单选题Do you often talk to each ______ in English?

单选题I was told that the woman was indifferent ______ hardships and dangers.

单选题 There are few more sobering online activities than entering data into college-tuition calculators and gasping as the Web spits back a six-figure sum. But economists say families about to go into debt to fund four years of partying, as well as studying, can console themselves with the knowledge that college is an investment that, unlike many bank stocks, should yield huge dividends. A 2008 study by two Harvard economists notes that the 'labor-market premium to skill'—or the amount college graduates earned that's greater than what high-school graduate earned—decreased for much of the 20th century, but has come back with a vengeance (报复性地) since the 1980s. In 2005, the typical full-time year-round U.S. worker with a four-year college degree earned $50,900, 62% more than the $31,500 earned by a worker with only a high-school diploma. There's no question that going to college is a smart economic choice. But a look at the strange variations in tuition reveals that the choice about which college to attend doesn't come down merely to dollars and cents. Does going to Columbia University (tuition, room and board $49,260 in 2007～08) yield a 40% greater return than attending the University of Colorado at Boulder as an out-of-state student ($35,542)? Probably not. Does being an out-of-state student at the University of Colorado at Boulder yield twice the amount of income as being an in-state student ($17,380) there? Not likely. No, in this consumerist age, most buyers aren't evaluating college as an investment, but rather as a consumer product—like a car or clothes or a house. And with such purchases, price is only one of many crucial factors to consider. As with automobiles, consumers in today's college marketplace have vast choices, and people search for the one that gives them the most comfort and satisfaction in line with their budgets. This accounts for the willingness of people to pay more for different types of experiences (such as attending a private liberal-arts college or going to an out-of-state public school that has a great marine-biology program). And just as two auto purchasers might spend an equal amount of money on very different cars, college students (or, more accurately, their parents) often show a willingness to pay essentially the same price for vastly different products. So which is it? Is college an investment product like a stock or a consumer product like a car? In keeping with the automotive world's hottest consumer trend, maybe it's best to characterize it as a hybrid (混合动力汽车) :an expensive consumer product that, over time, will pay rich dividends.

单选题 The patient complained that his doctor had been negligent in not giving him a full examination.

单选题Captain Sentry retired to the country because he was ______.

单选题After taking a six-week，fully paid maternity leave（产假）earlier this year，Francine Gemperle was anxious to resume her job but reluctant to be away from her baby daughter，Veronica.Fortunately，she didn’t

单选题Which of the following remains a unique feature of the English countryside? ______.

单选题______ do it myself than try to persuade such a silly fellow like him.

单选题 Directions: For this part, you are allowed 30 minutes to write an essay commenting on the saying 'A man's best friends are his ten fingers.' You can cite examples to illustrate the importance of personal struggle. You should write at least 150 words but no more than 200 words.

单选题There is only one difference between an old man and a young one: the young one has a glorious future before him and the old one has a______future behind him.