单选题To ______ concrete is to embed metal in it to make it stronger.

单选题The Olympic Games were watched by ______ billions of people around the world. A. virtually B. literally C. deliberately D. appropriately

单选题Information about cities, vegetation, and road overlying the terrain ______.

单选题According to the passage, the lack of critical attention paid to Jane Austin can be explained by all of the following nineteenth-century attitudes toward the novel EXCEPT ______.

单选题He passed ______ hours in the library; he acquired information relative to the subject he was going to expound. A. resulting B. resultative C. resultful D. resulted

单选题On turning round the corner we saw the road ______ steeply.

单选题In the sentence ‘ We are all liable....’ the author is

单选题When fire breaks out in a tunnel, the most important thing is to ______.

单选题Many people think that the standards of public ______ have declined. A. morality B. rightness C. awareness D. mentality

单选题The actors have to ______ before they appear in front of the strong lights on television. A. cover up B. make up C. paint up D. do up

单选题The single business of Henry Thoreau, during forty odd years of eager activity, was to discover an economy calculated to provide a satisfying life. His one concern, which gave to his ramblings in Concord fields a value of high adventure, was to explore the true meaning of wealth. As he understood the problems of economics, there were three possible solutions open to him, to exploit himself, to exploit his fellows, or to reduce the problem to its lowest denominator. The first was quite impossible——to imprison oneself in a treadmill when the morning called to great adventure. To exploit one's fellows seemed to Thoreau's sensitive social conscience an even greater infidelity. Freedom with abstinence seemed to him better than serfdom with material well-being, and he was content to move to Walden Pond and set about the high business of living, "to front only the essential facts of life and to see what it had to teach." He did not advocate that other men should build cabins and live isolated. He had no wish to dogmatize concernig the best mode of living——each must settle that for himself. But that a satisfying life should be lived, he was virtually concerned. The story of his emancipation from the lower economics is the one romance of his life, and Walden is his great book. It is a book in praise of life rather than of Nature, a record of calculating economies that studied saving in order to spend more largely. But it is a book of social criticism as well, in spite of its explicit denial of such a purpose. In considering the true nature of economy he concluded, with Ruskin, that the cost of a thing is the amount of life which is required in exchange for it, immediatey or in the long run. In Walden Thoreau elaborated the text: "The only wealth is life.\

单选题As a result, they had to ______ answering their letter by three days.

单选题{{B}}Passage Five{{/B}} Nanotechnology, according to its fans, will jump-start a new industrial revolution with molecular-sized structures as complex as the human cell and 100 times stronger than steel. The new technology transforms everyday products and the way they are made by manipulating atoms so that materials can be shrunk, strengthened and lightened all at once. To date only modest nanotech-based products--such as stain-resistant fabrics and fresh food packaging--have entered the market, but some scientists predict nanotechnology will eventually be the only game in town. "It will be a ubiquitous technology," said George Stephanopoulos, professor of chemical engineering at the Massachusetts Institute of Technology. He echoes other nanotech supporters who say industrial countries are already sliding toward its use in every aspect of manufacturing. Aided by recent advances in microscopes, scientists can now place single atoms where they want for the first time. The potential applications are numerous, with microscopic computers, cancer-killing antennae and nonpolluting car engines on the distant horizon. When it's all going to happen, though, is another matter. According to most scientific accounts, the nanotech future may be 10 to 20 years off. Major hurdles need to be jumped. First, there is a lack of economic mass production. Some of the more complicated devices would require exact placement of billions of atoms. "It may take the lifetime of the universe to complete the construction of (such a)device, " said George Barbastathis, assistant professor at NIT. Another challenge is bridging the nanoscale and macroscopic, he said. In other words, the smallness of a nano device is useless when it must be attached to large wires. It's unclear how scientists will overcome these problems. And fears derived from science fiction threaten to derail nano-technology even as it emerges, in much the same way popular anxiety over "super-weeds" and "frankenfoods" have hobbled biotechnology in agriculture and fear of "designer babies" has set back stem-cell research. Lured by a market with billions of dollars in potential profits, giants like GE, Intel, Motorola and IBM are already heavily involved in research. Worldwide, the two, industries with the potential to win big with nanotechnology are electronics and biotechnology, according to MIT researchers. On the biotech front, scientists are promoting the notion of nanoparticles made from gold that could be triggered remotely to heat and kill individual cancer cells. Nanotechnology holds equal promise for wealth creation, but there isn't a consensus among venture capitalists on how to realize it. "Which direction is it going to work out in? That's the question on everyone's mind," Gang Chen, an associate professor at the MIT, told scientists at a Boston nano gathering.

单选题Environmentalists ______ that it will not be easy to persuade car drivers to use their vehicles less often. A. deliver B. deserve C. contrast D. concede

单选题The brave fireman had fought for days before they managed to ______ the forest fire.

单选题Even 30 years later, he still ______ the memory of his happy and care-free childhood spent in that small wooden house with his grandparents.(2006年财政部财政研究所考博试题)

单选题Since the early nineties, the trend in most business had been toward on-demand, always-available products and services that suit the customer's ______ rather than the company's.

单选题The professor gave ______ instruction for carrying out the research project.