单选题Human facial expression differ from those of animals in the degree to which they can be Udeliberately/U contr011ed and modified.

单选题One theory Upostulates/U that the ancient Filipinos came from India and Persia.

单选题As a policeman, you should not ignore any particulars in an accident.

单选题At midnight, we were aroused by a knock at the door. A．irritated B．awakened C．arisen D．annoyed

单选题The great changes of the city astonished every visitor to that city

单选题They are still calculating the impact of automation on the lives of factory workers.A. affectB. influenceC. pressureD. passion

单选题The Emic and Etic Approaches Researchers who are unfamiliar with the cultural and ethnic groups they are studying must take extra precautions to shed any biases they bring with them from their own culture. For example, they must make sure they construct measures that are meaningful for each of the cultural or ethnic minority groups being studied. In conducting research on cultural and ethnic minority issues, investigators distinguish between the emic approach and the etic approach. In the emic approach, the goal is to describe behavior in one culture or ethnic group in term that are meaningful and important to the people in that culture or ethnic group, without regard to other cultures or ethnic groups. In the etic approach, the goal is to describe behavior so that generalizations can be made across cultures. If researchers construct a questionnaire in an emic fashion, their concern is only that the questions are meaningful to the particular culture or ethnic group being studied. If, however, the researchers construct a questionnaire in an eric fashion, they want to include questions that reflect concepts familiar to all cultures involved. How might the emic and eric approaches be reflected in the study of family processes? In the emic approach, the researchers might choose to focus only on middle-class White families, without regard to whether the information obtained in the study can be generalized or is appropriate for ethnic minority groups. In a subsequent study, the researchers may decide to adopt an etic approach by studying not only middle-class White families, but also lower-income White families, Black American families, Spanish American families, and Asian American families. In studying ethnic minority families, the researchers would likely discover that the extended family is more frequently a support system in ethnic minority families than in White American families. If so, the emic approach would reveal a more different pattern of family interaction than would the etic approach, documenting that research with middle class White families cannot always be generalized to all ethnic groups.

单选题Lower taxes would spur investment and help economic growth.

单选题It's {{U}}sensible{{/U}} to start any exercise program gradually at first.

单选题{{B}}第二篇{{/B}} Video recorders and photocopiers, even ticket machines on the railways, often seem unnecessarily difficult to use. Last December I bought myself a video cassette recorder(VCR) described as "simple to use". In the first three weeks I failed repeatedly to program the machine to record from the TV, and after months of practice I still made mistakes. I am not alone. According to a survey last year by Ferguson, the British manufacturer, more than one in four VCR owners never use the timer(定时器) on their machines to record a programme: they don' t use it because they've found it far too hard to operate. So why do manufacturers keep on designing and producing VCRs that are awkward to use if the problems are so obvious. First, the problem we notice are not obvious to technically minded (有技术思想的) designers with years o[ experience and trained to understand how appliances work. Secondly, designers tend to add one or two features at a time to each model, whereas you or I face all a machine' features at once. Thirdly, although finding problems in a finished product is easy, it is too late by then to do anything about the design. Finally, if manufacturers can get away with selling products that are difficult to use, it is not worth the effort of any one of them to make improvements. Some manufacturers say they concentrate on providing a wide range of features rather than on making the machines easy to use. But that gives rise to the question, "Why can't you have features that are easy to use?" The answer is you can. Good design practice is a mixture of specific procedures and general principles. For a start, designers should build an original model of the machine and try it out on typical members of the public—not on colleagues in the development laboratory. Simple public trials would quickly reveal many design mistakes. In an ideal world, there would be some ways of controlling quality such as that the VCR must be redesigned repeatedly until, say, 90 per cent of users can work 90 per cent of the features correctly 90 per cent of the time.

单选题The Foreign Service is a {{U}}branch{{/U}} of the Department of State. A. center B. division C. root D. base

单选题The telephone system is no longer Uoperative/U.

单选题Practically all animals communicate through sounds. A．Clearly B．Almost C．Absolutely D．Basically

单选题Teaching Math, Teaching Anxiety In a new study about the way kids learn math in elementary school, the psychologists at the University of Chicago Sian Beilock and Susan Levine found a surprising relationship between what female teachers think and what female students learn: If a female teacher is uncomfortable with her own math skills, then her female students are more likely to believe that boys are better than girls at math. "If these girls keep getting math-anxious female teachers in later grades, it may create a snowball effect on their math achievement, " said Levine. In other words, girls may end up learning math anxiety from their teachers. The study suggests that if these girls grow up believing that boys are better at math than girls are, then these girls may not do as well as they would have if they were more confident. Just as students find certain subjects to be difficult, teachers can find certain subjects to be difficult to learn-and teach. The subject of math can be particularly difficult for everyone. Researchers use the word "anxiety" to describe such feelings: anxiety is uneasiness or worry. The new study found that when a teacher has anxiety about math, that feeling can influence how her female students feel about math. The study involved 65 girls, 52 boys and 17 first-and second-grade teachers in elementary schools in the Midwest. The students took math achievement tests at the beginning and end of the school year, and the researchers compared the scores. The researchers also gave the students tests to tell whether the students believed that a math superstar had to be a boy. Then the researchers turned to the teachers: To find out which teachers were anxious about math, the researchers asked the teachers how they felt at times when they came across math, such as when reading a sales receipt. A teacher who got nervous looking at the numbers on a sales receipt, for example, was probably anxious about math. Boys, on average, were unaffected by a teacher's anxiety. On average, girls with mathanxious teachers scored lower on the end-of-the-year math tests than other girls in the study did. Plus, on the test showing whether someone thought a math superstar had to be a boy, 20 girls showed feeling that boys would be better at math-and all of these girls had been taught by female teachers who had math anxiety. "This is an interesting study, but the results need to be interpreted as preliminary and in need of replication with a larger sample, " said David Geary, a psychologist at the University of Missouri in Columbia.

单选题Denny is a robot guard, who

单选题While they were away on vacation, they allowed their mail to accumulate at the post office.

单选题阅读下面的短文，文中有15处空白，每处空白给出4个选项，请根据短文的内容从4个选项中选择1个最佳答案。 Geography is the study of the relationship between people and the land. Geographers(地理学家) compare and contrast{{U}} (51) {{/U}}places on the earth. But they also{{U}} (52) {{/U}}beyond the individual places and consider the earth as a{{U}} (53) {{/U}}. The word geography comes from two Greek words, ge , the Greek word for "earth" and graphein,{{U}} (54) {{/U}} "to write". The English word geography means "to describe the earth".{{U}} (55) {{/U}}geography books focus on a small area like a town or city. Others deal with a state, a region, a nation, or an{{U}} (56) {{/U}}continent. Many geography books deal with the whole earth. Another{{U}} (57) {{/U}}to divide the study of{{U}} (58) {{/U}}is to distinguish between physical geography and cultural geography. The former focuses on the natural world; the{{U}} (59) {{/U}}starts with human beings and studies how human beings and their environment act{{U}} (60) {{/U}}each other. But when geography is considered as a single subject,{{U}} (61) {{/U}}branch can neglect the other. A geographer might be described{{U}} (62) {{/U}}one who observes, records, and explains the{{U}} (63) {{/U}}between places. If places were alike, there would be little need for geographers. We know, however, {{U}}(64) {{/U}}no two places are exactly the same. Geography, then is a point of view, a special way of{{U}} (65) {{/U}}at places.

单选题The most important {{U}}result{{/U}} of the Lewis and Clark expedition was that it enabled the United States to claim the Oregon region.

单选题Renewable Energy Sources Today petroleum (石油) provides around 40% of the world's energy needs, mostly fuelling automobiles. Coal is still used, mostly in power stations, to cover one-quarter of our energy needs, but it is the least efficient, unhealthiest and most environmentally damaging fossil fuel (矿物燃料). Natural gas reserves could fill some of the gap from oil, but reserves of that will not last into the 22nd century either. Most experts predict we will exhaust easily accessible reserves within 50 years. Less-polluting renewable energy sources offer a more practical long-term energy solution. "Renewable" refers to the fact that these resources are not used faster than they can be replaced. Hydroelectric (水力发电的) power is now the most common form of renewable energy, supplying around 20% of world electricity. China's Three Gorges Dam is the largest ever. At five times the size of the US's Hoover Dam, its 26 turbines (涡轮机) will generate the equivalent energy of 18 coal-fired power stations. It will satisfy 3% of China's entire electricity demand. In 2003, the first commercial power station to use tidal (潮汐的) currents in the open sea opened in Norway. It is designed like windmill (风车), but others take the form of turbines. As prices fall, wind power has become the fastest growing type of electricity generation—quadrupling (翻两番) worldwide between 1999 and 2005. Modern wind farms consist of turbines that generate electricity. Though it will be more expensive, there is more than enough wind to provide the world's entire energy needs. Wind farms come in onshore and offshore forms. They can often end up at spots of natural beauty, and are often unpopular with residents. And turbines are not totally harmless—they can interfere with radar, alter climate and kill sea birds. Scotland is building Europe's largest wind farm, which will power 200,000 homes. The UK's goal is to generate one-fifth of power from renewable sources, mainly wind, by 2020. But this may cause problems, because wind is unreliable.