单选题Two thirds of the US basketball players are black, and the number would be greater ______ the continuing practice of picking white bench warmers for the sake of balance. A. was it not because of B. had it not been for C. were it not for D. would it not have been for

单选题Some educators try to put students of similar abilities into the same class because they believe this kind of ______ grouping is advisable. A. homogenous B. instantaneous C. spontaneous D. anonymous

单选题The United States has historically had higher rates of marriage than those of other industrialized countries. The current annual marriage 1 in the United States—about 9 new marriages for every 1,000 people—is 2 higher than it is in other industrialized countries. However, marriage is 3 as widespread as it was several decades ago. 4 of American adults who are married 5 from 72 percent in 1970 to 60 percent in 2002. This does not mean that large numbers of people will remain unmarried 6 their lives. Throughout the 20th century, about 90 percent of Americans married at some 7 in their lives. Experts 8 that about the same proportion of today"s young adults will eventually marry. The timing of marriage has varied 9 over the past century. In 1995 the average age of women in the United States at the time of their first marriage was 25. The average age of men was about 27. Men and women in the United States marry for the first time an average of five years later than people did in the 1950s. 10 , young adults of the 1950s married younger than did any previous 11 in U.S. history. Today"s later age of marriage is 12 the age of marriage between 1890 and 1940. Moreover, a greater proportion of the population was married (95 percent) during the 1950s than at any time before 13 Experts do not agree on why the "marriage rush" of the late 1940s and 1950s occurred, but most social scientists believe it represented a 14 to the return of peace and prosperity after 15 years of severe economic 15 and war.

单选题Is language, like food, a basic human need without which a child at a critical period of life can be starved and damaged? Judging from the drastic experiment of Frederick II in the thirteenth century, it may be hoping to discover what language a child would speak if he heard no mother tongue, he told the nurses to keep silent. All the infants died before the first year. But clearly there was more than lack of language here. What was missing was good mothering. Without good mothering, in the first year of life especially, the capacity to survive is seriously affected. Today no such severe lack exists as that ordered by Frederick. Nevertheless, some children are still backward in speaking. Most often the reason for this is that the mother is insensitive to the signals of the infant, whose brain is programmed to learn language rapidly. If these sensitive periods are neglected, the ideal time for acquiring skills passes and they might never be learned so easily again. A bird learns to sing and to fly rapidly at right time, but the process is slow and hard once the critical stage has passed. Experts suggest that speech stages are reached in a fixed sequence and at a constant age, but there are cases where speech has started late in a child who eventually turns out to be of high IQ. At twelve weeks a baby smiles and makes Vowel-like sounds; at twelve months he can speak simple words and understand simple commands; at eighteen months he has a vocabulary of three to fifty words. At three he knows about 1, 000 words which he can put into sentences, and at four his language differs from that of his parents in style rather than grammar. Recent evidence suggests that an infant is born with the capacity to speak. What is special about man's brain, compared with that of the monkey, is the complex system which enables a child to connect the sight and feel of, say, a toy-bear with the sound pattern "toy-bear" . And even more incredible is the young brain's ability to pick out an order in language from the mixture of sound around him, to analyze, to combine and recombine the parts of a language in new ways. But speech has to be induced, and this depends on interaction between the mother and the child, where the mother recognizes the signals in the child's babbling, grasping and smiling, and responds to them. Insensitivity of the mother to these signals dulls the interaction because the child gets discouraged and sends out only the obvious signals. Sensitivity to the child's non-verbal signals is essential to the growth and development of language.

单选题______, there are more similarities between various people of the world than there are differences.

单选题Three years have ______ since we last met at the conference for Internet communication in Beijing.

单选题Some people feel that television should give less ______ to sport. A. programs B. coverage C. concern D. involvement

单选题The girl was ______ a shop assistant, she is now a manager in a large department store. A. preliminarily B. presumably C. formally D. formerly

单选题The term nonverbal communication ______ a number of categories: body language, vocal intonations, physical objects, and space, among others.

单选题Large companies need a way to reach the savings of the public at large. The same problem, on a smaller scale, faces practically every company trying to develop new products and create new Jobs. There can be little prospect of raising the sort of sum needed from friends and people we know, and while banks may agree to provide short-terra finance, they are generally unwilling to provide money on a permanent basis for long-term projects. So companies turn to the public, inviting people to lend them money, or take a share in the business in exchange for a share in future profits. This they do by issuing stocks and shares in the business is new development if they are to serve us properly, and requires more money than is raised through the Stock Exchange. By doing so they can put into circulation the savings of individuals both at home and overseas. When the saver needs his money back he does not have to go .to the company with which he originally placed it. Instead, he sells his shares through a stockbroker (证券经纪人) to some other saver who is seeking to invest his money. Many of the services needed both by industry and by each of us are provided by the Government or by local authorities. Hospitals, roads, electricity, telephones, equipment and new development, if they are to serve us properly, require more money than is raised through taxes alone. The government, local authorities, and nationalized industries therefore frequently need to borrow money to finance major capital spending, and then too, come to the Stock Exchange. There is hardly a man or woman in this country whose job or whose standard of living does not depend on the ability of his or her employers to raise money to finance new development. In one way or another this new money must come from the savings of the country. The Stock Exchange exists to provide a channel through which these savings can reach those who need finance. (353 words)

单选题In a recent book entitled The Psychic Life of Insects, Professor Bouvier says that we must be careful not to credit the little winged fellows with intelligence when they behave in what seems like an intelligent manner. They may be only reacting. I would like to confront the professor with an instance of reasoning power on the part of an insect which cannot be explained away in any other manner. During the summer of 1899, while I was at work on my doctoral thesis, we kept a female wasp at our cottage. It was more like a child of our own than a wasp, except that it looked more like a wasp than a child of our own. That was one of the ways we told the difference. It was still a young wasp when we got it (thirteen or fourteen years old) and for some time we could not get it to eat or drink, it was so shy. Since it was a female we decided to call it Miriam, but soon the children's nickname for it-- " Pudge" --became a fixture, and "Pudge" it was from that time on. One evening I had been working late in my laboratory fooling around with some gin and other chemicals, and in leaving the room I tripped over a nine of diamonds which someone had left lying on the floor and knocked over my card index which contained the names and addresses of all the larvae worth knowing in North America. The cards went everywhere. I was too tired to stop to pick them up that night, and went sobbing to bed, just as mad as I could be. As I went, however, I noticed the wasp was flying about in circles over the scattered cards. "Maybe Pudge will pick them up," I said half laughingly to myself, never thinking for one moment that such would be the case. When I came down the next morning Pudge was still asleep in her box, evidently tired out. And well she might have been. For there on the floor lay the cards scattered all about just as I had left them the night before. The faithful little insect had buzzed about all night trying to come to some decision about picking them up and arranging them in the boxes for me, and then had figured out for herself that, as she knew practically nothing of larvae of any sort except wasp larvae, she would probably make more of a mess of rearranging them than if she had left them on the floor for me to fix. It was just too much for her to tackle, and, discouraged, she went over and lay down in her box, where she cried herself to sleep. If this is not an answer to Professor Bouvier's statement, I do not know what is.

单选题His ______ with computers began six months ago.(2007年中国科学院考博试题)

单选题The last guests to reach the hotel ______ at 12 o'clock at night. A. checked out B. checked up C. checked in D. chock on

单选题During their first teacher training year, the students often visited schools for the ______ of lessons. [A] observation [B] investigation [C] inspection [D] examination

单选题When it comes to the slowing economy, Ellen Spero isn"t biting her nails just yet. But the 47-year-old manicurist isn"t cutting, filing or polishing as many nails as she"d like to, either. Most of her clients spend $12 to $ 50 weekly, but last month two longtime customers suddenly stopped showing up. Spero blames the softening economy. "I"m a good economic indicator," she says. "I provide a service that people can do without when they"re concerned about saving some dollars." So Spero is downscaling, shopping at middle-brow Dillard"s department store near her suburban Cleveland home, instead of Neiman Marcus. "I don"t know if other clients are going to abandon me, too," she says. Even before Alan Greenspan"s admission that America"s red-hot economy is cooling, lots of working folks had already seen signs of the slowdown themselves. From car dealerships to Gap outlets, sales have been lagging for months as shoppers temper their spending. For retailers, who last year took in 24 percent of their revenue between Thanksgiving and Christmas, the cautious approach is coming at a crucial time. Already, experts say, holiday sales are off 7 percent from last year"s pace. But don"t sound any alarms just yet. Consumers seem only mildly concerned, not panicked, and many say they remain optimistic about the economy"s long-term prospects even as they do some modest belt-tightening. Consumers say they"re not in despair because, despite the dreadful headlines, their own fortunes still feel pretty good. Home prices are holding steady in most regions. In Manhattan, "There"s a new gold rush happening in the $4 million to $10 million range, predominantly fed by Wall Street bonuses," says broker Barbara Corcoran. In San Francisco, prices are still rising even as frenzied overbidding quiets. "Instead of 20 to 30 offers, now maybe you only get two or three," says John Tealdi, a Bay Area real-estate broker. And most folks still feel pretty comfortable about their ability to find and keep a job. Many folks see silver linings to this slowdown. Potential home buyers would cheer for lower interest rates. Employers wouldn"t mind a little fewer bubbles in the job market. Many consumers seem to have been influenced by stock-market swings, which investors now view as a necessary ingredient to a sustained boom. Diners might see an upside, too. Getting a table at Manhattan"s hot new Alain Ducasse restaurant used to be impossible. Not anymore. For that, Greenspan & Co. may still be worth toasting.

单选题Oxford University would be excluded out of those universities that receive PhD grants from ESRC, because the completion rate of its PhD students' theses within four years is lower than ______.

单选题There are some people who will always______a cause merely because others are attacking or criticizing it.

单选题She was ______ by the lack of appreciation shown of her hard work.