单选题The longevity of successful companies is determined by______.

单选题The organization issued a cry of alarm last week, citing “__________ evidence” that those children are not receiving the same quality of education as their richer peers.

单选题I have______Mr. Roberts to serve in my place during my absence.

单选题They are taught by their superiors that a soldier who______his post in time of war is to be shot.(2002年厦门大学考博试题)

单选题This method ______ my headache. It really takes effect. A. soothes B. sobers C. soars D. soaks

单选题 It didn't happen overnight. The problem of polluted air has been festering for centuries. Suddenly the problem of air pollution is becoming critical and is erupting right before our eyes. Not only do our eyes bum as they focus through murky air, but when the air clears, we see trees and vegetation dying. We must realize that this destruction can no longer be pinned to some mysterious cause. The one major culprit is air pollution. Today's air pollution is an unfortunate by-product of the growth of civilization. Civilized mall desires goods that require heavy industrialization and mass production. Machines and factories sometimes pollute and taint the air with substances that are dangerous to man and the environment. These substances include radioactive dust, salt spray, herbicide and pesticide aerosols, liquid droplets of acidic matter, gases, and sometimes soil particles. These materials can act alone to irritate objects and forms of life. More dangerously, they join together to act upon the environment. Only lately have we begun recognizing some of their dangerous consequences. Scientists have not yet been able to obtain a complete report on the effects of air pollution on trees. They do know, however, that sulfur dioxide, fluorides, and ozone destroy trees and that individual trees respond differently to the numerous particulate and gaseous pollutants, Sometimes trees growing in a single area under attack by pollutants will show symptoms of injury or will die while their neighbors remain healthy. Scientists believe this difference in response depends on the kind of tree and its genetic makeup. Other factors, such as the tree's stage of growth and nearness to the pollution source, the amount of pollutant, and the length of the pollution attack also play a part. In short, whether or not a tree dies as a result of air pollution depends on a combination of host and environmental factors. For the most part, air pollutants injure trees. To conifers, which have year-round needles, air pollution causes early balding. In this event, trees cannot maintain normal food production levels. Undernourished and weakened, they are open to attack by a host of insects, diseases, and other environmental stresses. Death often follows. Air pollution may also cause hardwoods to lose their leaves. Because their leaves are borne only for a partion of the year and are replaced the following year, air pollution injury to hardwoods may not be so severe.

单选题The lawyer ______his ideas loudly and clearly at the court, which surprised her a great deal. A. acclaimed B. admonished C. addressed D. asserted

单选题The rose may grow as low bush or as a tree, ______.

单选题The shark's best sense is smell because ______.

单选题I was lucky because I had turned my back on ______, pursuing instead common-sense reality. A. illustration B. illusion C. imagination D. imitation

单选题Monkeys are excellent climbers, and most are ______ tree dwellers.

单选题As a good photographer, you must develop an awareness of the world around you and the people who ______ it.

单选题The government slated new elections in the spring, largely as a result of the public Uclamor/U.

单选题She is unconscious now, but may ______ at intervals.

单选题Mary didn't ______the new rule that her father made of being home at 5 o'clock.

单选题The energy crisis, which is being felt around the world, has dramatized how the careless use of the earth's resources has brought the whole world to the brink of disaster. The overdevelopment of motor transport, with its【C1】______of more cars, more highways, more pollution, more suburbs, more commuting, has【C2】______to the near-destruction of our cities, and the pollution not only of【C3】______air, but also of the earth's atmosphere. The disaster has arrived in the【C4】______of the energy crisis. Our present【C5】______is unlike war, revolution or depression. It is also unlike the great natural disasters of the past. Worldwide resources【C6】______and energy use have brought us to a state【C7】______long-range planning is essential. What we need is not a continuation of our present serious state, which【C8】______the future of our country, our children, and our earth.【C9】______a movement forward to a new norm in order to work rapidly and effectively on planetary problems. This country has been falling back under the continuing exposures of loss of【C10】______. There is a strong demand for moral revival and【C11】______some devotion that is vast enough and yet【C12】______enough to enlist the devotion of all. In the past it has been only in a way in【C13】______of their own country【C14】______any people have been able to【C15】______themselves wholeheartedly. This is the first time we have been asked to defend ourselves and what we hold dear in【C16】______with all the other inhabitants of this planet, who【C17】______with us the same endangered air and the same endangered oceans. There is a【C18】______need to reassess our present course, and to【C19】______new methods through which the world can survive. This is priceless【C20】______.

单选题What might be the ultimate result of a biased bitter criticism?

单选题For laymen ethnology is probably the most interesting of the biological sciences for the very reason that it concerns animals in their normal activities and therefore, if we wish, we can assess the possible dangers and advantages in our own behavioral roots. Ethnology also is interesting methodologically because it combines in new ways very scrupulous field observations with experimentation in laboratories. The field workers have had some handicaps in winning respect for themselves. For a long time they were considered as little better than amateur animal-watchers—certainly not scientists, since their facts were not gained by experimental procedures, they could not conform to the hard-and-fast rule that a problem set up and solved by one scientist must be tested by other scientists, under identical conditions and reaching identical results. Of course many situations in the lives of animals simply cannot be rehearsed and controlled in this way. The fall flocking of wild free birds can't be, or the homing of animals over long distances, or even details of spontaneous family relationships. Since these never can be reproduced in a laboratory, are they then not worth knowing about? The ethnologists who choose field work have got themselves out of this impasse by greatly refining the techniques of observing. At the start of a project all the animals to be studied are live-trapped, marked individually, and released. Motion pictures, often in color, provide permanent records of their subsequent activities. Recording of the animals' voices by electrical sound equipment is considered essential, and the most meticulous notes are kept of all that occurs. With this material other biologists, far from the scene, later can verify the reports. Moreover, two field observers often go out together, checking each other's observations right there in the field. Ethnology, the word, is derived from the Greek ethos, meaning the characteristic traits or features which distinguish a group—any particular group of people or, in biology, a group of animals such as a species. Ethnologists have the intention of studying "the whole sequence of acts which constitute an animal's behavior". In abridged dictionaries ethnology is sometimes defined simply as "the objective study of animal behavior", and ethnologists do emphasize their wish to eliminate myths.