单选题Interest is steadily spreading from a minority of enthusiasts in developing renewable sources of energy—wind, wave and solar power, tidal and geothermal energy. Additional support for them has come with a proposal to explore the untapped sources of hydro-electric power in Scotland. The details are presented by Mr. William Manser in a study called "The Case for an Inquiry into Hydro-Electric Generation in the North of Scotland" He calls for an expert committee to look at the developments possible for hydro-electric sites and, more important, for means of financing them. There is a clear industrial connection in Mr. Manser's study because it was done for the Federation of Civil Engineering Contractors; hydro-electric schemes, by definition, have a large civil engineering component in them. Mr. Manser estimates that wind power could theoretically provide more than 7 per cent of electricity supply in the United Kingdom, provided suitable sites for generators could be found. However, the practical viability of wind power generation is not likely to be understood until 1990. Other developments using renewable energy sources are also at an early stage as far as their commercial possibilities are concerned, he believes. The best developed and most suitable form of renewable energy is, in his view, hydro-power. The technology has been developed over centuries and is still progressing. At present it is the cheapest form of electricity generation. Mr. Manser examined past surveys of the north of Scotland and identified several as suitable for hydro-electric generation. Those are in the remote areas, usually of great natural beauty. But Mr. Manser says a well-designed dam can be impressive in itself. It is also possible to make installations as unobtrusive as possible, to the point of burying parts of them. Hydro-generation involves no water pollution, smoke creation or unsightly stocking-out yards. The main trouble, appearing from his report, is financing an undertaking which has a heavy initial capital cost, and very low running costs. However, Mr. Manser does not see that as an unfamiliar position for the electricity industry. He cites the proposed construction of the new nuclear power station at Sizewell in Suffolk, which will have a high initial capital cost. The argument as Sizewell that the reason for the expenditure is that the capital will provide a benefit in lower costs and higher returns in the long-term, applies equally to hydro-electric generation.

单选题In the past ten years skyscrapers have developed______ in Chicago and New York City.(2011年四川大学考博试题)

单选题Prepaid college tuition is generally designed on the principle that ______.

单选题When Columbus reached the New World, corn was the ______ in America.

单选题Can the Internet help patients jump the line at the doctor"s office? The Silicon Valley Employers Forum, a sophisticated group of technology companies, is launching a pilot program to test online "virtual visits" between doctors at three big local medical groups and about 8,000 employees and their families. The six employers taking part in the Silicon Valley initiative, including heavy hitters such as Oracle and Cisco Systems, hope that online visits will mean employees won"t have to skip work to tend to minor ailment or to follow up on chronic conditions. "With our long commutes and traffic, driving 40 miles to your doctor in your hometown can be a big chunk of time," says Cindy Conway, benefits director at Cadence Design Systems, one of the participating companies. Doctors aren"t clamoring to chat with patients online for free; they spend enough unpaid time on the phone. Only 1 in 5 has ever E-mailed a patient, and just 9 percent are interested in doing so, according to the research firm Cyber Dialogue. "We are not stupid," says Stirling Somers, executive director of the Silicon Valley Employers group. "Doctors getting paid is a critical piece in getting this to work." In the pilot program, physicians will get $ 20 per online consultation, about what they get for a simple office visit. Doctors also fear they"ll be swamped by rambling E-mails that tell everything but what"s needed to make a diagnosis. So the new program will use technology supplied by Healinx, an Alameda, Calif.-based start-up. Healinx"s "Smart Symptom Wizard" questions patients and turns answers into a succinct message. The company has online dialogues for 60 common conditions. The doctor can then diagnose the problem and outline a treatment plan, which could include E-mailing a prescription or a face to face visit. Can E-mail replace the doctor"s office? Many conditions, such as persistent cough, require a stethoscope to discover what"s wrong—and to avoid a malpractice suit. Even Larry Bonham, head of one of the doctor"s groups in the pilot, believes the virtual doctor"s visits offer a "very narrow" sliver of service between phone calls to an advice nurse and a visit to the clinic. The pilot program, set to end in nine months, also hopes to determine whether online visits will boost worker productivity enough to offset the cost of the service. So far, the Internet"s record in the health field has been underwhelming. The experiment is "a huge roll of the dice for Healinx," notes Michael Barrett, and analyst at Internet consulting from Forester Research. If the "Web visits" succeed, expect some HMOs (Health Maintenance Organizations) to pay for online visits. If doctors, employers, and patients aren"t satisfied, figure on one more E-health start-up to stand down.

单选题In the 1930"s, when millions of comic books were ______ the young with fighting and killing, nobody seemed to notice that the violence of cars in the streets was more hysterical.

单选题In the phrase "without setting up a network of interlocking crystals customarily associated with that process" in the second paragraph, a substitute for the word "customarily" may be ______.

单选题When Sagan told the director about what the dolphin had done, the director ______.

单选题In contrast, when the general population of a society is going through the early stages of social mobilization, language group conflicts seem particularly likely to occur. They may develop animosities which take on a life of their own and persist beyond the situation which gives rise to them. The degree to which this happens may be significantly affected by the type of policy which the government adopts during the transitional period.

单选题What he expressed as a mere supposition was taken by others as a positive statement.

单选题The ambient noise imaging is able to locate the whales even when they are silent because ______.

单选题Don't keep us in______any longer. Tell us what happened so that we can give you a hand.

单选题 Various innovations have been introduced as ways to break off our system which forces students through a series of identical classrooms in which teachers do most of the talking and students have little opportunity to respond. Among these innovations are team teaching and teacher aides, non-graded elementary and secondary schools, independent study, curricula focused on helping students discover things for themselves rather than on trying to tell them everything, and schools designed for maximum flexibility so that students can work alone, or in small groups, or take part in large group instruction via diverse media. The aim of all these innovations is to adapt instruction more precisely to the needs of each individual student. Many people who have a strong dislike to organizing instruction scientifically and to bringing new technology into the schools and colleges fail to realize that the present system is in many respects mechanical and rigid. The vast differences in the ways students learn are disregarded when they are taught the same thing, in the same way, at the same time. There is no escaping the evidence that many students themselves feel little enthusiasm and even outright hostility for the present way schools and collages are organized and instruction is handled. Many of them resent technology, but what they object to is usually technology used as a means for handling a large number of students. Or it is programming which merely reproduces conventional classroom responds and learns, reaching new plateaus from which to climb to higher levels of understanding. Technological media can store information until it is needed or wanted. They can distribute it over distances to reach the student where he happens to be. They can present the information to the student through various senses. They can give the student the opportunity to react to the material in many ways. In short, the student's opportunities for learning can be increased and enhanced by using a wide range of instructional technology. All the available resources for instruction, including the teacher, can work together to create conditions for maximum effective learning.

单选题The pioneers of the teaching of science imagined that its introduction into education would remove the conventionality, artificiality, and backward-lookingness which were characteristic of classical studies, but they were gravely disappointed. So, too, in their time had the humanists thought that the study of the classical authors in the original would banish at once the dull pedantry and superstition of mediaeval scholasticism. The professional schoolmaster was a match for both of them, and has almost managed to make the understanding of chemical reactions as dull and as dogmatic an affair as the reading of Virgil"s Aeneid. The chief claim for the use of science in education is that it teaches a child something about the actual universe in which he is living in making him acquainted with the results of scientific discovery, and at the same time teaches him how to think logically and inductively by studying scientific method. A certain limited success has been reached in the first of these aims, but practically none at all in the second. Those privileged members of the community who have been through a secondary or public school education may be expected to know something about the elementary physics and chemistry of a hundred years ago, but they probably know hardly more than any bright boy can pick up from an interest in wireless or scientific hobbies out of school hours. As to the learning of scientific method, the whole thing is probably a farce. Actually, for the convenience of teachers and the requirements of the examination system, it is necessary that the pupils not only do not learn scientific method but learn precisely the reverse, that is, to believe exactly what they are told and to reproduce it when asked, whether it seems nonsense to them or not. The way in which educated people respond to such quackeries as spiritualism or astrology, not to say more dangerous ones such as racial theories or currency myths, shows that fifty years of education in the method of science in Britain or Germany has produced no visible effect whatever. The only way of learning the method of science is the long and bitter way of personal experience, and, until the educational or social systems are altered to make this possible, the best we can expect is the production of a minority of people who are able to acquire some of the techniques of science and a still smaller minority who are able to use and develop them.

单选题When he applied for a ______ in the office of the local newspaper he was told to see the manager. A. location B. profession C. career D. position

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单选题The prime minister's proposal for new taxes created such a(n)______that his government fell.

单选题Every community requires a wholesome, dependable supply of water, and every community generates liquid and solid wastes. A. considerable B. healthful C. immediate D. secure