单选题 To get some idea of the amount of heat the sun gives off, think about this. If you could collect all the heat that hits the earth in a two-week period, it would equal the amount of all other known sources and reserves of energy: Wood, coal and oil. But even these sources of energy depend on the sun for their formation. For example, a tree would certainly never grow and provide fuel in the form of wood were it not for the sun. Because the sun is so important in the production of all forms of heating fuel, more and more time and money are being spent studying ways to change power from the sun directly into a form of heat. The process currently in use for collecting energy from the sun--known as solar energy--is quite simple. The sunlight hits a metal plate known as a flat-plate collector and the plate absorbs the heat front the sun. This heat, in turn, heats a liquid inside the plate. A layer of fiber-glass inside the plate helps prevent this heat from escaping. In this way, solar heat can be stored in a liquid solution equalling about 1,000 watts of electricity per square meter. In the 1960s, a solar furnace was installed in the Pyreness Mountains of France to test the use of solar energy. In this furnace, a mirror is used to concentrate the sun's heat. This concentrated heat keeps temperature in the furnace as high as 6,000 °F.

单选题______, the old professor is still trying to learn a foreign language.

单选题What will the company do in the future?

单选题It is not urgent, so you may do it ______ your leisure. A. at B. in C. by D. with

单选题 Conversation 2

单选题They will buy the car ______ it costs. A. whenever B. wherever C. however D. whatever

单选题To the list may ______ some other names.A) be addedB) added beC) addD) add be

单选题This is the ______ painting, and these others are copies.

单选题What soy bean product can be used to enrich baked foods?

单选题Conversation 2

单选题In such fields as advertising, show business, and journalism, the charm and publicity are worth more than any monetary benefit.

单选题There is a nice-looking car there. Peter wonders ______.

单选题Enclosed please find a check for US ＄91 to cover the insurance．

单选题Every 14 days a language dies. By 2100, more than half of the more than 7,000 languages spoken on earth will likely disappear, taking with them a wealth of knowledge about history, culture, the natural environment, and how the human brain works. Language defines a culture. Words that describe a particular cultural practice or idea rarely translate precisely into another language. Many endangered languages have rich oral cultures with stories, songs, and histories passed on to younger generations, hut no written forms. With the disappearance, an entire culture is lost. Much of what humans know about nature is expressed only in oral languages. Indigenous (土著) groups that have interacted closely with the natural world for thousands of years often have deep insights into local lands, plants, animals, and ecosystems (生态环境). Studying indigenous languages therefore benefits environmental understanding. Studying various languages also increases our understanding of how humans communicate and store knowledge. Every time a language dies, we lose part of the picture of what our brains can do. Throughout human history, the languages of powerful groups have spread while the languages of smaller cultures have become extinct. As a big language spreads, children whose parents speak a small language often grow up learning the big language. Those children or their own children may never learn the small language, or they may forget it as it falls out of use. This has occurred throughout human history, but the rate of language disappearance has quickened dramatically in recent years.

单选题Cambridge University provides opportunities for educational achievement which are probably unequalled. This is, above all, the place for students with inquiring minds who want to extend their mastery of an educational discipline. The admission standard is high-the great majority of entrants (入学者) have at least AAB grades at GCE A-level (or the equivalent), but learning ability is the only quality they all share. Students at Cambridge come from a wide range of educational and social backgrounds. Whatever your background, you yourself have to make the decision to apply, and you, as an individual, will be considered for admission. At Cambridge, Open Days are arranged to help you to experience the atmosphere and see the facilities in a college. Admissions and teaching staff will be there to answer any questions about educational matters, your qualifications, life in a college and so on. This would be the moment to discuss your school courses, if they are in any way different from conventional academic A-levels. If you cannot come to an Open Day, an informal visit to a college can often be arranged, by contacting the Admissions Office well beforehand. Cambridge graduates traditionally go into a very wide range of occupations. Usually over a quarter will continue with some form of further study, either for a higher degree or for a vocational ( 职业的 ) qualification.

单选题People, young and old, ought to take physical examinations at regular intervals so as to know their own health.

单选题Economy seems to be the only ______to the financial problem.

单选题Which do you think is ______ important, health or wealth? A) most B the most C) the more D) more

单选题Youth is a state of mind, not a matter of rosy cheeks or red lips; it is a matter of the will, a quality of the imagination. A. 青年向往的不是红润的容颜，而是意志的坚定与想象的敏锐。 B. 青春不是朱唇红颜，而是心理状态，是意志与想象力的体现。 C. 青春不是朱唇红颜，而是一种思想，是意志与想象力的体现。 D. 青春在于表达心声，不在于红润的容颜，尽在于意志与品质。 E. 是否青年在于心态，不在于红润的容颜，全在于意志与品质。

单选题The author implies that the use of mobile phones in such places as museums should be ________.