单选题When a system is unjust to the ______ abolition, not reform, is what respect for justice demands.(2002年中国科学院考博试题)

单选题When we feel stressed, our adrenal glands release a peptide called Cortisol. Our body responds with Cortisol whether it faces physical, environmental, academic, or emotional danger. This triggers a string of physical reactions including depression of the immune system, tensing of the large muscles, blood-clotting, and increasing blood pressure. It's the perfect response to the unexpected presence of a sable-toothed tiger. But in school, that kind of response leads to problems. Chronically high Cortisol levels lead to the death of brain cells in the hippocampus, which is critical to explicit memory formation. These physical changes are significant. Stanford scientist Robert Sapolsky found that atrophy levels in the hippocampus of Vietnam veterans with PTSD (post-traumatic stress disorder) ranged from 8 to 24 percent above the control group. Chronic stress also impairs a student's ability to sort out what's important and what's not. Jacobs and Nadel (1985) suggest that thinking and memory are affected under stress. The brain's short-term memory and ability to form long-term memories are inhibited. There are other problems. Chronic stress makes students more susceptible to illness. In one study, students showed a depressed immune system at test time; they had lower levels of an important antibody for fighting infection. This may explain the vicious academic cycle; more test stress means more sickness, which means poor health and missed classes, which contribute to lower test scores. A stressful physical environment is linked to student failure. Crowded conditions, poor student relationships, and even lighting can matter. Optometrist Ray Gottlieb says that school stress causes vision problems. That in turn impairs academic achievement and self-esteem. He says that, typically, a stressed child will constrict breathing and change how he or she focuses to adapt to the stress. This pattern hurts learning in the short and long run. Under stress, the eyes become more attentive to peripheral areas as a natural way to spot predators first. This makes it nearly impossible to track across a page of print, staying focused on small areas of print.

单选题Dogs are social animals and without proper training, they will behave like wild animals. They will soil your house, destroy your belongings, bark excessively, fight other dogs and even bite you. Nearly all behavior problems are perfectly normal dog activities that occur at the wrong time or place or are directed at the wrong thing. The key to preventing or treating behavior problems is learning to teach the dog to redirect its normal behavior to outlets that are acceptable in the domestic setting. One of the best things you can do for your dog and yourself is to obedience train it. Obedience training doesn"t solve all behavior problems, but it is the foundation for solving just about any problem. Training opens up a line of communication between you and your dog. Effective communication is necessary to instruct your dog about what you want it to do. Training is also an easy way to establish the social rank order. When your dog obeys a simple request of "come here, sit," it is showing obedience and respect for you. It is not necessary to establish yourself as top dog or leader of the dog pack by using extreme measures. You can teach your dog its subordinate role by teaching it to show submission to you. Most dogs love performing tricks for you to pleasantly accept that you are in charge. Training should be fun and rewarding for you and your dog. It can enrich your relationship and make living together more enjoyable. A well-trained dog is more confident and can more safely be allowed a greater amount of freedom than an untrained animal.

单选题Which of the following, if true, best completes the passage below? The traditional view of Homer is that of a blind bard who wrote down the epic poems known as the Iliad and the Odyssey in the eighth century B.C.E. We know now, however, that this picture cannot be true. The language used in the epic poems contains elements of the Greek language dating from the twelfth to the eighth centuries B.C.E., but the Greek writing system was not developed until the late seventh century, when it was used to record clerical notes. A more accurate statement regarding Homer, therefore, is that, if he existed, he most likely A. wrote the poems down in the fifth century B.C.E., using a pre-existing oral tradition of Greek epic poetry. B. was involved in the recording of clerical notes in Greek in the seventh century. C. composed the poems orally in the eighth century and then dictated them to a scribe in the late seventh century. D. composed the poems orally in the twelfth century, using a predecessor of the Greek language. E. composed the poems orally in the eighth century, using elements of pre-existing Greek epic poetry.

单选题The ticket ______ you to a free meal in our restaurant. A. permits B. credits C. grants D. entitles

单选题With a tremendous roar from its rocket engine, the satellite is sent up into the sky. Minutes later, at an altitude of 300 miles, this tiny electronic moon begins to orbit about the earth. Its radio begins to transmit a staggering amount of information about the satellite's orbital path, the amount of radiation it detects, and the presence of meteorites. Information of all kinds races back to the earth. No human being could possibly copy down all these facts, much less remember and organize them. But an electronic computer can. The marvel of the machine age, the electronic computer has been in use only since 1946. It can do simple computations—add, subtract, multiply, and divide—with lightning speed and perfect accuracy. It can multiply two 10-digit numbers in 1/1, 000 second, a problem that would take an average person five minutes to do with pencil and paper. Some computers can work 500, 000 times faster than any person can. Once it is given a program, that is, a carefully worked-out set of instructions devised by a technician trained in computer language, a computer can gather a wide range of information for many purposes. For the scientist it can get information from outer space or from the depths of the ocean. In business and industry the computer prepares factory inventories, keeps track of sales trends and production needs, mails dividend checks, and makes out company payrolls. It can keep bank accounts up to date and make out electric bills. If you are planning a trip by plane, the computer will find out what route to take and what space is available.

单选题Most American tourists visit China just for ______.

单选题The concept of "environment" is certainly difficult and may even be misunderstood; but we have no handy substitute. It seems simple enough to distinguish between the organism and the surrounding environment and to separate forces acting on an organism into those that are internal and biological and those that are external and environmental. But in actual practice this system breaks down in many ways, because the organism and the environment are constantly interacting so that the environment is modified by the organism and vice versa. In the case of man, the difficulties with the environmental concept are even more complicated because we have to deal with man as an animal and with man as a bearer (持有者) of culture. If we look at man as an animal and try to analyze the environmental forces that are acting on the or-ganism, we find that we have to deal with things like climate, soil, plants, and such-like factors common to all biological situations; but we also find, always, very important environmental in-fluences that we can only class as "cultural", which modify the physical and biological factors. But man, as we know him, is always a bearer of culture; and if we study human culture, we find that it, in turn, is modified by the environmental factors of climate and geography. We thus easi-ly get into great difficulties from the necessity of viewing culture, at one moment, as a part of the man and, at another moment, as a part of the environment.

单选题Please telephone me half an hour ______.

单选题During the rainy season the Mississippi River may carry away hundreds of acres of valuable topsoil from one area and arbitrarily deposit in another.

单选题 In 2009 the European Commission carried out an investigation into Microsoft. The American software giant tied Internet Explorer, its web browser, into Windows, the operating system in the great majority of personal computers. This, thought the commission, might be an abuse of its dominance in operating systems: buy a PC, and unless you took the trouble of choosing otherwise, you would browse the web through Explorer. In December that year Microsoft promised that until 2014 it would provide a "choice screen", asking European Windows users whether they wanted to install another browser. The screen first turned up in March 2010. Jolly good—but Microsoft forgot to keep its word. On March 6th the competition commissioner, Joaquin Almunia, said he had fined it 561m ($732m) for not including the choice screen with 15m copies of Windows software between May 2011 and July 2012. Neither Microsoft nor the commission spotted the lapse. It seems that eventually other companies did. The fine must sting all the more because Microsoft's transgression brought it little if any gain. Explorer has fallen behind Chrome, made by Google, and Firefox, made by Mozilla, a non-profit organisation. And people are doing more and more browsing on smartphones and tablets, the domain of Apple, Google and their browsers. Microsoft's antitrust woes in Europe should have been over. In 2004 in was fined 497m for trying its media player and server operating systems with it PC system. In 2008 it copped another 899m penalty for failing to comply with the commission's ruling in that case. Lately it has been among the accusers—of Google, which Mr. Almunia has been investigating since 2010. He suspects Google of abusing a position in online search every bit as imposing as Microsoft's in PC operating systems. Bing, Microsoft's search engine, is a distant second. The commissioner believes that Google may be favouring its own specialised services at rival's expense; that its deals with publishers may unfairly exclude competitors; and that it prevents advertisers from taking their data elsewhere. Mr. Almunia asked Google to propose by the end of January ways of meeting his concerns. He has not yet said what it suggested or how he will respond. European antitrust cases have a habit of dragging on. Just ask Microsoft.

单选题 {{U}} (31) {{/U}}, optical illusion can cut highway crashes. Japan is a case {{U}}(32) {{/U}}. It has reduced automobile crashes on some roads {{U}}(33) {{/U}} nearly 75 percent using a simple optical illusion. Bent stripes, called chevrons {{U}}(34) {{/U}} the roads make drivers think that they are driving faster than they really are, and thus drivers slow down. Now the American Association Foundation for Traffic Safety in Washington D. C. is planning to {{U}}(35) {{/U}} Japan's success. Starting next year, the foundation will paint chevrons and other patterns of stripes on selected roads mound the country to test how well the patterns reduce highway crashes. Excessive speed plays a major role {{U}}(36) {{/U}} one fifth of all fatal traffic accidents, according to the foundation. {{U}}(37) {{/U}} those accidents, the foundation will conduct its tests in areas where speed-related hazards are {{U}}(38) {{/U}}-- curves, exit slopes, traffic circles, and bridges. Some studies suggest that straight, horizontal bars painted across roads can initially {{U}}(39) {{/U}} the average speed of drivers in half {{U}}(40) {{/U}} , traffic often returns to full speed within, months as drivers become used to seeing the painted bar.

单选题Rarely ______ so difficult a problem. A. she could have faced with B. could have she faced with C. she could have been faced with D. could she have been faced with

单选题______ of March is my sister"s birthday.

单选题Primary batteries of cells are those that, once ______, are discarded.

单选题Of the three cavities.______is the most variable and active in amplifying and modifying speech sounds.(北二外2004研)

单选题The newcomers found it impossible to______ themselves to the climate sufficiently to make permanent homes in the new country.(2014年厦门大学考博试题)

单选题I don't know what______ Alfred to read your letter. ______he thought it was addressed to him.

单选题Woman: What do you think of the prospects for on-line education? Is it going to replace the traditional school?Man: I doubt it. Schools are here to stay, because there are much more than just book learning. Even though more and more kids are going on-line, I believe fewer of them will quit school altogether.Question: What does the man think of conventional schools?