单选题The automobile has given people incredible freedom of movement. It enables them to decide where and when they want to go. The automobile influences where people live and work and how they spend their leisure time. The striking changes in people's lives created by the automobile began in the United States and have since spread across much of the globe, especially in developed countries. But even in developing nations, the automobile is increasingly reshaping patterns of living. When the first automobiles were produced, only the well-to-do could afford them. Soon, however, prices declined as production increased in response to the flowing demand. The lower prices put the automobile within reach of more and more Americans. Well-off urban residents found car ownership cheaper than keeping a horse and carriage. The growth in car ownership led to the building of more and better roads, which further increased travel throughout the nation. Before the development of automobiles, urban workers walked, bicycled, or rode horse-drawn vehicles to their jobs. But as roads improved and car ownership expanded, workers no longer had to live near their jobs. During the 1920s, people in U. S. cities increasingly moved to the suburbs because of the freedom provided to the workers by automobile ownership. By the mid-1950s, even factories had begun to relocate in the suburbs. Wherever people have easy access to automobiles, cars play a major role in social life and the choice of recreational activities. People find it fun to hop in the car and visit friends and relatives, whether the drive takes a few minutes, hours, or days. The automobile helps make it easy to organize picnics, family reunions, and other get-togethers. Trips by automobiles to such places as theme parks, national parks and mountain and seashore resorts are a favorite type of vacation for many people.

单选题______ happens in the world makes us happy and sad by turns.A. ThatB. WhatC. WhichD. Whether

单选题In this experiment, they were wakened several times during the night and asked to report what they ______. A. had just been dreaming B. have just been dreaming C. are just dreaming D. had just dreamed

单选题Man: I wonder if you find my experience relevant to the job. Woman: Yes, certainly, but if only you had sent in your application letter a week earlier. Question: What does the woman imply? A. The man is not suitable for the position. B. The job has been given to someone else. C. She had received only one application letter. D. The application arrived a week earlier than expected.

单选题Our brains could be hard-wired to be male or female long before we begin to grow testes(丸)or ovaries(卵巢)in the womb. This discovery might explain why some people feel trapped in a body that's the wrong sex, and could also lead to tests that reveal the true "brain sex" of babies born with ambiguous genitalia(生殖器). Till now, the orthodoxy among developmental biologists has been that embryos develop ovaries and become female unless a gene called SRY on the Y chromosome is switched on. If this gene is active, it makes testes develop instead. This switch is seen as the key event in determining whether a baby is a girl or a boy. Only after the gonads(性腺) form and flood the body with the appropriate hormones, the theory goes, is the sex of our minds and bodies determined. But in a study of mice, a team at the University of California, Los Angeles, has now found that males and females show differences in the expression of no fewer than 50 genes well before SRY switches on. "It's the first discovery of genes differentially expressed in the brain, "says Eric Vilain, who led the UCLA team. "They may have an impact on the hard-wired development of the brain in terms of sexual differentiation independent of gonadal induction." Vilain is presenting details of seven of the 50 genes to the annual meeting of the American Society of Human Genetics in Baltimore this week. Three of these genes are dominant in females and four are dominant in males. The next step for Vilain and his team will be to show that the genes in question really do influence brain sexuality—and not just in mice. This is likely to be a much tougher proposition than merely showing there are differences in expression. But if the findings are confirmed, they could one day yield blood tests that allow doctors to establish the brain sex of babies born with genitalia that share features of both sexes. At present doctors and parents have to guess which gender to assign for surgical "correction".

单选题Space is a dangerous place, not only because of meteors but also because of rays from the sun and other stars. The atmosphere again acts as our protective blanket on earth. Light gets through, and this is essential for plants to make the food which we eat. Heat, too, makes our environment endurable. Various kinds of rays come through the air from outer space, but enormous quantities of radiation from the sun are screened off. As soon as men leave the atmosphere they are exposed to this radiation. But their spacesuits or the walls of their spacecraft, if they are inside, do prevent a lot of radiation damage. Radiation is the greatest known danger to explorers in space. The unit of radiation is called "rein". Scientists have reason to think that a man can put up with far more radiation than 0.1 ream without being damaged; the figure of 60 rems has been agreed on. The trouble is that it is extremely difficult to be sure about radiation damage——a person may feel perfectly well, but the cells of his or her sex organs may be damaged, and this will not be discovered until the birth of deformed (畸形的) children or even grandchildren. Missions of the Apollo flights have had to cross belts of high radiation and, during the outward and return journeys, the Apollo crew accumulated a large amount of reams. So far, no dangerous amounts of radiation have been reported, but the Apollo missions have been quite short. We simply do not know yet how men are going to get on when they spend weeks and months outside the protection of the atmosphere, working in a space laboratory. Drugs might help to decrease the damage done by radiation, but no really effective ones have been found so far.

单选题Implied but not stated is that ______. A. laser-doppler radar is more accurate than microwave radar B. microwave radar operates at a higher frequency than laser-doppler radar C. the light-beam radar can measure only slow speeds with accuracy D. microwave radar may not ensure absolute precision in measuring varying speeds

单选题The chairman made a(n) ______ statement before beginning the main business of the meeting.

单选题He was______enough to understand my question from the gesture I made.

单选题It was not until December 31 ______we finally got a letter from him,

单选题Who ______ the workers to take up the struggle?

单选题Washington Irving was America"s first man of letters to be known internationally. His works were received enthusiastically both in England and in the United States. He was, in fact, one of the most successful writers of his time in either country, delighting a large general public and at the same time winning the admiration of fellow writers like Scott in Britain and Poe and Thoreau in the United States. The respect in which he was partly owing to the man himself, with his warm friendliness, his good sense, his politeness, his gay spirit, his artistic integrity, his love of both the Old World and the New. Thackeray described Irving as a "gentleman, who, though himself born in no very high sphere, was most finished, polished, witty; socially the equal of the most refined Europeans". In England he was granted an honorary degree from Oxford—an unusual honor for a citizen of a young, uncultured nation—and received the medal of the Royal Society of Literature. America made him ambassador to Spain. Irving"s background provides little to explain his literary achievements. A gifted but delicate child, he had little schooling. He studied law, but without enthusiasm, and never did practice seriously.

单选题2 The longitudinal study demonstrates that students who receive ESL (English as a sec ond language) instruction are far better than those taught primarily in their native lan guage. A comparison of the three-year exit rates for students in ESL and bilingual programs shows that those who receive ESL instruction test out faster and in higher percentages than those who receive instruction in their native language, regardless of the grade in which they entered school. For example, 79.3 percent of the children who entered ESL programs in kindergarten tested out, while only 51.5 percent of those who received their education in their native languages did. Likewise, 72.9 percent of the LEP (limited English profi ciency) students who entered programs in the first grade tested out. while only 38.5 of those in bilingual programs did. For students who entered LEP programs in the ninth grade, 91.6 percent of those in native-language instruction classes still hadn't tested out after three years, as compared with 78.1 percent of those in ESL classes. Furthermore, children who had been in ESL classes tested 4 higher in English and math once they exited LEP programs than those who had received native-language instruc tion. Of the LEP students who entered in kindergarten or the first grade, 49 percent of those who had been in ESL classes eventually read at grade level, while only 32 percent of those who had been in bilingual classes performed that well. In math. the statistics are even more impressive. Of the children who entered in kindergarten or the first grade, more than 69 percent of those who had been in ESL classes eventually performed at grade level or above, as opposed to 54 percent of those who had been in bilingual classes. Naturally, the study provoked a barrage of criticism from the highly political and vo cal bilingual lobby, which prompted the New York City Board of Education to issue a pa per in November 1994 mitigating the findings of the study and ignoring the distinction be tween students in ESL and bilingual education programs. Rather than exit rates, this paper focuses on the achievement of LEP students during the period in which they are in bilingual or ESL classes. The authors show that although the scores of LEP students were below av erage on the English-language test, their scores in all areas showed improvement; they point out that in math, there were insufficient data on the progress of LEP students to draw valid conclusions. However, a report on citywide mathematics test results in New York in the spring of 1995 deals more fully with the math scores of the 26,248 students who were examined the previous school year in Chinese, Spanish, or Haitian Creole. According to this document, only 16.6 percent of these children performing at or above grade level in mathemat ics. Although this represents an improvement of 1.1 percent over the scores of the previous year, it discredits the argument that native-language instruction keeps performing at grade level in subject areas. Although LEP students are improving faster than the national norm, they continue to perform far below the norm.

单选题In most of the universities, English is a(n) ______ subject for the non-English major M. A. and M. S. students. A. initial B. classic C. comprehensive D. compulsory

单选题These explorers received liberal rewards for the risks they had taken and felt proud.

单选题"Can it be sin to know? / Can it be death? And do they only stand/By ignorance?" are taken from the literary work written by______.

单选题A: It is not like George to be late for an appointment. B: ______ He's always punctual. A. No way. B. Anyway he's late. C. I don't think so. D. You're right.

单选题Among the films being nominated(提名) ______ directed by Zhang Yimou.A. is a popular filmB. is as popularC. a popular filmD. one is popular

单选题"Time is money" here means ______.