未知题型 All types of stress study, whether under laboratory or real-life situations, study mechanisms for increasing the arousal level of the brain.The brain blood flow studies show that reciting the days of the week and months of the year increases blood flow in appropriate areas, whereas problem solving which demands intense concentration of a reasoning type produces much larger changes in the distribution of blood in the brain.Between these basic studies of brain function and real-life situations there is still a considerable gap, but reasonable deduction seems possible to try and understand what happens to the brain. Life consists of a series of events which may be related to work or to our so-called leisure timE.Work may be relatively automatic--as with typing, for instancE.It requires intense concentration and repetition during the learning phase to establish a pattern in the brain. Then the typist's fingers automatically move to hit the appropriate keys as she reads the words on the copy.However, when she gets tired she makes mistakes much more frequently. To overcome this she has to raise her level of arousal and concentration but beyond a certain point the automatic is lost and thinking about hitting the keys leads to more mistakes.Other jobs involve intense concentration such as holding bottles of wine up to a strong light and turning them upside down to look for particles of dirt falling down. This sounds quite easy but experience teaches that workers can do this for only about thirty minutes before they start making a mistakE.This is partly because the number of occasions with dirt in the bottle is low and the arousal level, therefore, fails. Scientists have shown that devices to raise arousal level will increase the accuracy of looking for relatively rare events. A recent study of the effect of loss of sheep in young doctors showed that in tests involving a challenge to their medical judgment when short of sleep they raised their arousal level and became better at tests of grammatical reasoning as well.According to the brain flow studies, problem solving ______.A.increases blood flow in some areas of the brain.B.causes changes in the distribution of blood in the brain.C.demands intense concentration of blood in certain areasD.is based on the ability to recite the time

未知题型 A 'knockout' is arranged ______.A.to keep the price in the auction room lowB.to allow one dealer only to make a profitC.to increase the auctioneer's profitD.to help the auctioneer

未知题型 Whenever two or more unusual traits or situations are found in the same place, it is tempting to look for more than a coincidental relationship between them. The high Himalayas and the Tibetan plateau certainly have extraordinary physical characteristics, and the cultures which are found there are also unusual, though not uniquE.However, there is no intention of adopting Montesquieu's view of climate and soil as cultural determinants. The ecology of a region merely poses some of the problems faced by the inhabitants of the region, and while the problems facing a culture are important to its development, they do not determine it.The appearance of the Himalayas during the late Tertiary Period and the accompanying further raising of the previously established rages had a marked effect on the climate of the region. Primarily, of course, it blocked the Indian monsoon (季风) from reaching Central Asia at all. Secondarily, air and moisture from other directions were also reduceD.Prior to the raising of the Himalayas, the land now forming the Tibetan uplands had a dry continental climate with vegetation and animal life similar to that of the rest of the region on the same parallel, but somewhat different than that of the areas farther north, which were already drier. With the coming of the Himalayas and the relatively sudden drying out of the region, there was a severe thinning out of the animal and plant population. The ensuing incomplete Pleistocene glaciations (冰蚀) had a further thinning effect, but significantly did not wipe out life in the areA.Thus after the end of the glaciations there were only a few varieties of life extant from the original continental species. Isolated by the Kunlun range from the Tarim basin and Turfan depression, species which had already adapted to the dry steppe climate, and would otherwise have been expected to flourish in Tibet, the remaining native fauna and flora (动植物群) multiplieD.Armand describes the Tibetan fauna as not having great variety, but being 'striking' in the abundance of the particular species that are present. The plant life is similarly limited in variety, with some observers finding no more than seventy varieties of plants in even the relatively fertile Eastern Tibetan valleys, with fewer than ten food crops. Tibetan 'tea' is a major staple, perhaps replacing the unavailable vegetables.The difficulties of living in an environment at once dry and cold, and populated with species more usually found in more hospitable climates, are great. These difficulties may well have influenced the unusual polyandrous (一妻多夫的) societies typical of the region. Lattimore sees the maintenance of multiple-husband households as being preserved from earlier forms by the harsh conditions of the Tibetan uplands, which permitted no experimentation and 'froze' the cultures which came therE.Kawakita, on the other hand, sees the polyandry as a way of easily permitting the best householder to become the head husband regardless oF.agE.His detailed studies of the Bhotea village of Tsumje do seem to support this idea of polyandry as a method of talent mobility is a situation where even the best talent is barely enough for survival.In sum, though arguments can be made that a pre-existing polyandrous system was strengthened and preserved (insofar as it has been) by the rigors of the land, it would certainly be an overstatement to lay causative factors of any stronger nature to the ecological influences in this casE.What are the 'unusual traits or situations' referred to in the first sentence?A.Patterns of animal and plant growth.B.Food and food preparation patterns of the upland Tibetans.C.Social and familial organization of typical Tibetan society.D.All of the abovE.

未知题型 The authors' knowledge of Tibet is probably ______.A.based on firsthand experienceB.the result of lifelong studiesC.derived from books onlyD.limited to geological history

未知题型 Most of us would like to be both (1)_____ and creativE.Why was Thomas Edison able to invent so many things? Was he simply more intelligent than most people? Did he spend long hours toiling away in private? Surprisingly, when Edison was a young boy, his teacher told him he was too (2)_____ to learn anything. Other famous people whose creative genius went (3)_____ when they were young include Walt Disney, who was fired from a newspaper job because he did not have any good ideas and Enrico Caruso, whose music teacher told him that his (4)_____ was terriblE.Disney, Edison and Caruso were intelligent and creative men; (5)_____, experts on creativity believe that intelligence is not the same as creativity. Creativity is the ability to think about something in new and unusual ways, and to (6)_____ out unique solutions to problems. When creative people are asked what enables them to solve problems in new ways, they say that the ability to find affinities between (7)_____ unrelated elements plays a key rolE.They also say that they have the time and independence in a(an) (8)_____ setting to (9)_____ a wide range of possible solutions to a problem.How strongly is creativity (10)_____ to intelligence? (11)_____ most creative people are quite intelligent, the (12)_____ is not necessarily truE.Many highly intelligent people (13)_____ measured by IQ tests) are not very creativE.Some experts remain skeptical that we will ever fully understand the creative process. Others believe that a psychology of creativity is within reach. Most experts agree, (14)_____, that the concept of creativity as (15)_____ bubbling up from a magical (16)_____ is a myth. Momentary (17)_____ of insight, (18)_____ by images, make up a (19)_____ part of the creative process. At the heart of the creative process are ability and experience that (20)_____ an individual's effort, often over the course of a lifetimE.A.imaginativeB.brilliantC.inventiveD.original

未知题型 By 'at best, the results point to the least change people can expect', (Paragraph 3) the researchers try to tell us thatA.the impact of climate change is relatively minor.B.the global warming is inevitable in the near futurE.C.concentrations of greenhouse gases cannot be held steady.D.the atmospheric conditions will be better than people think.

未知题型 “ (3) ”是访问某网站的正确网址。D.ceiaeC.org@index-htm

单项选择题 请观赏张以庆导演的纪录片《幼儿园》和罗斯托茨基导演《这里的黎明静悄悄》（1972年），选出错误的一项 幼儿园 张以庆 朗读四季 间歇摇.mp4 这里的黎明静悄悄  shan.mp4 A. 这两段视频都有间歇摇B. 间歇摇是在机位不动的摇摄过程中，展现主体时稍作停顿，用于并列表现、介绍三个或以上主体及其联系 C. 只有水平横摇，没有斜摇，更没有其他类型的摇D. 间歇摇可以在不同的方向上进行

未知题型 听力原文： 'High tech 'and 'state of the art' are two expressions that describe very modern technology. High tech is just a shorter way of saying high technology. And high technology describes any invention, system or device that uses the newest ideas or discoveries of science and engineering.What is high tech? A computer is high tech. So is a communications satellitE.A modern manufacturing system is surely high tech.High tech became a popular expression in the United States during the early 1980's. Because of improvements in technology, people could buy many new kinds of products in American stores, such as home computers, microwave ovens, etC.'State of the art' is something that is as modern as possiblE.It is a product that is based on the very latest methods and technology. Something that is 'state of the art' means the newest possible design or product of a business or industry. A state of the art television set, for example, uses the most modern electronic design and parts. It is the best that one can buy.'State of the art' is not a new expression. Engineers have used it for years, to describe the best and most modern way of doing something.Millions of Americans began to use the expression in the late 1970's. The reason was the computer revolution. Every computer company claimed that its computers were 'state of the art'.Computer technology changed so fast that a state of the art computer today might be old tomorrow. The expression 'state of the art' became as common and popular as computers themselves. Now all kinds of products are said to be 'state of the art'.(30)A.To tell what 'high tech' and 'state of the art' arE.B.To tell how 'high tech' and 'state of the art' have developeD.C.To give examples of high tech.D.To describe the modern technology.

未知题型 同卵双生子的大脑在遗传上是完全相同的。当一对同卵双生子中的一个人患上精神分裂症时，受感染的那个人的大脑中的某个区域比没受感染的那个人的大脑中的相应区域小。当双胞胎中的两个人都没有精神分裂症时，两人就没有这样的差异。因此，这个发现为精神分裂症是由大脑的物质结构受损而引起的理论提供了确定的证据。 下面哪一点是上述论述需要的假设?D.当一对同卵双生子都患有精神分裂症时，他们大脑的大小是一样的。