单选题Noise Pollution Psychologists now believe that noise has a considerable effect on people's attitudes and behavior. Experiments have proved that in noisy situations (even temporary ones), people would have more irritability (躁易怒) and less cooperation. In more permanent noisy situations, many people cannot work hard, and they suffer from severe anxiety as well as other psychological problems. Some researchers, who study various aspects of effect of noise in people's mental life, maintain that noise, either temporary noise or permanent noise, often destroy creativity and activity by disturbing people's emotion and make them more irritable and hard to cooperate. However, psychologists distinguish between "sound" and "noise". "Sound" is measured physically in decibels (分贝). "Noise" cannot be measured in the same way because it refers to the psychological effect of sound and its level of "intensity" depends on the situation. Thus, for passengers at an airport who expect to hear airplanes taking off and landing, there may be a lot of sound, but not much noise (that is, they are not bothered by the noise). By contrast, if you are at a concert and two people behind you are whispering, you feel they are talking noisily even if there is not much sound. You notice the noise because it affects you psychologically. Both sound and noise can have negative effects, but what is most important is if the person has control over the sound. People walking down the street with earphones, listening to music that they enjoy, are receiving a lot of decibels of sound, but they are probably happy hearing sounds which they control. On the other hand, people in the street without earphones must tolerate a lot of noise which they have no control over. It is noise pollution that we need to control in order to help people live more happily.

单选题He spoke so quickly that it was difficult to take down what he was saying.

单选题These are their motives for doing it A. reasons B. excuses C. answers D. plans

单选题All the changes that have {{U}}overtaken{{/U}} Shetland recently.

单选题The firm of Bonnin and Morris in Philadelphia was probably the first American company to manufacture porcelain.A. silverwareB. crystalC. chinaD. linen

单选题 阅读下面这篇短文，短文后列出7个句子，请根据短文的内容对每个句子做出判断。 {{B}} On British Newspapers{{/B}} Besides the daily newspapers, there are a number of Sunday newspapers in Britain. Many of them are connected with the "dailies", though not run by the same editor and his members. The Sunday papers are larger than the daily papers and usually contain more articles concerned with comment (评论) and general information rather than news. The national daily and Sun day papers have the largest circulation(发行) in the world. Of the Sunday papers, the Observer and the Sunday Times are the best known. It is a regrettable fact that the number of magazines of a literary or political nature has dropped down since the war. This has probably been caused by the ever-wider use of radio and television. The most successful magazines are those published for women. Their covers are designed to catch the eye, and they certainly succeed in doing so! They offer their readers articles on cookery (烹饪法), fashion, needlework, and many other matters of women interest. They also provide advice to those in love, and adventures with handsome heroes. Some women's magazines also include serious articles of more general interest. The visitor who looks at the magazines displayed in a large bookstall (书摊) which may be found in an important railway station will notice that there is a wide variety of technical or semitechnical(半专业的) books and magazines. There are magazines for the motorist, the farmer, the gardener, the nurse, and many others. There are many local and regional newspapers. It is common in Britain for a news agent(报刊经售人) to deliver (投递) the morning papers to his customers for a small extra payment, this service is usually performed by boys and girls who want to earn some pocket-money.

单选题The government is debating the education laws.

单选题The change in that village was miraculous .

单选题The high-speed trains can have a major U impact/U on our lives．

单选题We have to act within the existing legal framework .

单选题It can be seen from the passage that the earth's supply of natural medicines A. may never be exhausted. B. may be dropping rapidly. C. is surprisingly big. D. is as rich-as ever.

单选题My friend"s reply was courteous but firm.

单选题The Television Camera The television camera is rather like the human eye. Both the eye and the camera have a lens, and both produce a picture on a screen. In each case the picture is made up of millions of spots of light. Let us see how the eye works. When we look at an object, a person, a house, or whatever it may be, we do not see all the details of the object in one piece. We imagine that we do, but this is not the case. In fact, the eye builds up the picture for us in our brain, which controls our sight, in millions of separate parts, and although we do not realize it, all these details are seen separately. This is what happens when we look at something. Beams of light of different degrees of intensity, reflected from all parts of the object, strike the lens of the eye. The lens then gathers together the spots of light from these beams and focuses them on to a light-sensitive plate, the retina, at the back of the eyeball. In this way an image of the object is produced on the retina in the form of a pattern of lights. The retina contains millions of minute light-sensitive elements, each of which is separately connected to the brain by a tiny fiber in the optic nerve. These nerve fibers, working independently, pick out minute details from the image on the retina and turn the small spots of light into nerve impulses of different strengths. They then transmit these impulses to the brain. They do this all at the same time. All the details of the image are fed to the brain, and, so we have taught our brain to add them together correctly. We see a clear picture of the object as a whole. Television, which means vision at a distance, operates on a similar principle. A television picture is built up in thousands of separate parts. Beams of light reflected from the subject being televised strike the lens of the television camera, which corresponds to the lens of the eye. The camera lens gathers together the spots of light from these beams and focuses an image of the subject on to a plate, the surface of which is coated with millions of photo-electric elements sensitive to light. The spots of light forming the image on the plate cannot be transmitted as light. So they are temporarily converted by an electronic device into millions of electrical impulses; that is, into charges of electricity.' These electrical impulses are then sent through space on a wireless wave to the homes of the viewers. They are picked up by the aerials and conveyed to the receivers the to television sets. There, they are finally converted back into the spots of light that make up the picture on the television screen.

单选题She always finds fault with everything.

单选题 下面的短文有15处空白，请根据短文内容为每处空白确定1个最佳选项。 {{B}}Migrant workers{{/B}} In the past twenty years, there has been an increasing tendency for workers to move from one country to another.{{U}} (51) {{/U}}some newly independent countries have understandably restricted most jobs to local people, others have attracted and welcomed migrant workers. This is particularly the case in the Middle East,{{U}} (52) {{/U}}increased oil incomes have enabled many countries to{{U}} (53) {{/U}}outsiders to improve local facilities.{{U}} (54) {{/U}}the Middle East has attracted oil-workers from the U. s. A. and Europe. It has brought in construction workers and technicians from many countries,{{U}} (55) {{/U}} South Korea and Japan. In view of the difficult living and working conditions in the Middle East, it is not{{U}} (56) {{/U}}that the pay is high to attract suitable workers. Many engineers and technicians can earn at least{{U}} (57) {{/U}} money in the Middle East as they can in their own country, and this is a major attraction. An allied benefit is the low taxation or complete lack of it. This increases the net amount of pay received by visiting workers and is very popular with them. Sometimes a disadvantage has a compensating advantage.{{U}} (58) {{/U}}, the difficult living conditions often lead to increased friendship when workers have to depend on each other{{U}} (59) {{/U}}safety and comfort.{{U}} (60) {{/U}}, many migrant workers can save large sums of money partly{{U}} (61) {{/U}} the lack of entertainment facilities. The work is often complex and full of problems but this merely presents greater challenge to engineers who prefer to find solutions{{U}} (62) {{/U}}problems rather than do routine work in their home country. One major problem which{{U}} (63) {{/U}}migrant workers in the Middle East is that their jobs are temporary ones. They are nearly always on contract, so it is not easy for them to plan ahead with great confidence. This is to be expected since no country welcomes a large number of foreign workers as permanent residents.{{U}} (64) {{/U}}, migrant workers accept this disadvantage, along with others, because of the{{U}} (65) {{/U}}financial benefits which they receive.

单选题A new system of quality control was {{U}}brought in{{/U}} to overcome the defects in the firm's products.

单选题Recent studies have posed the question as to whether there is a link between thing and that person.A. supposedB. pogedC. arousedD. raised

单选题 Ulcers Even though ulcers appear to run in families, lifestyle plays more of a role than genetic factors in causing the illness, according to a report in the April 13th Journal of Internal Medicine. In particular, smoking and stress in men and the regular use of pain releasing medicines in women were linked with an increased risk of developing all ulcers. Overall, 61% of ulcer risk appears to be due to environmental factors, such as smoking, and the remaining 39% is due to genes according to Dr. Ismo Raiha Of the University of Turky and colleagues at the University of Helsinki, Finland. Some researchers had suggested that families may spread Helicobacteria pylori, the bacteria that can cause ulcers. However, the new study suggests this is unlikely, according to the report. Raiha and colleagues studied data from more than 13,000 pairs of twins "to examine the roles of genetic and environmental factors in the origin of peptic ulcer disease", they explain. Both twins were more likely to develop an ulcer if the pair were genetically the same as compared with a pair of fraternal twins, suggesting that there must be some genetic susceptibility to ulcer development. However, the risk was no greater in twins living together compared with twins living apart, suggesting that shared exposure to H. pylori (幽门螺旋菌) was not to blame. "Environmental effects were not due to factors shared by family members, and they were related to smoking and stress in men and the use of analgesics in women," the authors wrote. "The minor effects of shared environment to disease liability do not support the concept that the grouping of risk factors, such as H. pylori infection, would explain the genetic factor of peptic ulcer disease, "they concluded.

单选题The defeated troops were ordered to scatter and then {{U}}concentrate{{/U}} fifty miles to the south.

单选题Silk, although it is considered a delicate fabric, is in fact very strong, but it is adversely affected by sunlight.A. softB. sheerC. fragileD. refined