These reactions increase the probability of incomplete combustion and are more likely to（）uncombusted and photochemically active hydrocarbon compounds into the atmosphere.

A . Water carriage B . Pipeline transport C . Rail transport D . Surface transport

A . generation Y ,raised on video, comprises 17 percent of the world population B . the annual growth rate of the video-conferencing market is 23 percent C . the U.S internet traffic annual growth rate is more than 40 percent D . thecisco long-term growth-rate target is 12 percent to 17 percent

A . Optical network B . Network management C . Storage-area network (SAN) D . Content delivery network (CDN)

A . all are correct B . ②and③are correct C . none of the above is correct D . ①only is correct

A．A.should do B．B.needn’t have done C．C.must have done D．D.mustn't have done

A．hang on B．draw on C．wait on D．count on

Population control has long been a subject of discussion among researchers. Some have argued that the supply of good land is limited. In order to feed a large population, bad land must be cultivated and the good land overworked. As a result, each person produces less in a given amount of time and this means a lower average income than could be obtained with a smaller population. Other researchers have argued that a large population gives more scope for the development of facilities such as sports, roads and railways, which are not likely to be built unless there is a big demand to justify them. Similarly, it can be argued that the public costs of society will not be so heavy to each individual if they are shared among the members of a large population. One of the difficulties in implementing birth control lies in the fact that the official attitudes to population growth vary from country to country. In underdeveloped countries where a large population is pressing hard upon the limits of food, space and natural resources, it will be the first concern of government to place a limit on the birthrate. In a well-developed society the problem may be more complex. A declining birthrate may lead to unemployment because it results in a shrinking market. Cities with a declining population may have to face the prospect of a shrinking tax base and a fall in land values. If there are fewer children going to school, teachers may be thrown out of work. When the pressure of population on housing declines, prices also decline and the building industry is weakened. Faced with considerations such as these, the government of a developed country may well prefer to see a slowly increasing population, rather than one which is stable or in decline. The writer suggests that policy makers should consider cultural values ______. A．in carrying out family planning B．in producing birth control drugs C．in improving public health standards D．in introducing birth control techniques

While three of them, including Lehman Brothers, take a dim view of the prospects for American shares, the other four have either marginally increased their allocations, or have maintained them at the same levels as in the previous quarter. Lehman Brothers seems to have decided that the prospect for German shares is better than it is for American ones. Its allocation for American equities dropped by seven percentage points, to 45% of its equity holdings; while its German share portfolio increased by six percentage points, to 11%. Lehman's share allocation to America has dropped, even as its overall equity holdings have increased. Daiwa and Standard Life are the other two that have cut back on American equities. But Credit Suisse continues to be a cheerleader for American shares. Following its ten percentage-point increase in the third quarter, the Swiss firm increased its exposure to American equities once again in the fourth quarter. Commerz International appears to share Credit Suisse's bullish outlook: its American equity holdings have increased by four percentage points, to 490. Julius Baer is extremely bullish on American equities, with 60% of its equity funds parked there. But the average American equity holdings, among our institutional investors dropped by a percentage point in the fourth quarter. British equities seem to have become attractive—all our investors have increased their allocations. Credit Suisse, which in the third quarter cut its investment in British shares, appears to have changed its mind. It has increased its allocation by four percentage points, taking the total to 9%. On the other hand, Japanese shares have been given the thumbs-down: all our investors save Julius Baer (unchanged) and Credit Suisse (slightly up) have moved funds out of Japanese equities. It is a relatively similar story for Japanese bonds, where everybody apart from Commerz International has either dropped their yen-denominated bond holdings, or kept them unchanged. Robeco Group seems decidedly bearish, for it has sharply, cut its allocation, from 24% to 15%. Lehman Brothers, appears to have got the timing right, by raising its allocation of dollar-denominated bonds in the fourth quarter. Its increase was followed by the Fed interest-rate cut on January 3rd. Will Lehman's bearish timing prove right for American shares, too？ Lehman Brothers______. A．has increased its equity and bond allocation in America B．pays less attention to the equity holdings because of the American economy's slowdown C．is pessimistic about the American prospect and cautious about its allocation D．is as bearish as other institutional investors

：A.2.22 B.7.38 C.14.77

A．Artificial-hip implant surgery can cause severe complications, such as infection, chronic fever, and bone degeneration, and these complications can themselves be crippling or even fatal. B．Almost all artificial-hip implant recipients receive their implants at an age when they are unlikely to live more than an additional 30 years. C．Although artificial-hip implants increase the risk of cancer after about 45 years of use, a few of the cancers they induce are not fatal. D．Since artificial-hip implants are not very common, banning them would cause little hardship. E．Although the benefits of artificial-hip implant surgery have remained substantially the same over the past decade, the price of the surgery has risen considerably.

A、$0 B、$10,000 C、$25,000 D、$30,000 E、$50,000

These crimes are not usually committed by people who are poor or in need. Young people often dislike and hate the adult world. They will do things to show that they are rebels. Also in Britain today it is easier for young people to commit crimes because they have more freedom to go where they like and more money to do what they like. There are two other possible causes which are worth mentioning. More and more people in Britain live in large towns. In a large town no one knows who anyone else is or where they live. But in the village I come from crimes are rare because everyone knows everyone else. Although it is difficult to explain, I think the last cause is very important. Perhaps there is something with our society which encourages violence and crime. It is a fact that all the time children are exposed to films and reports about crime and violence. Many people do not agree that this influences the young people, but I think that young people are very much influenced by the society they grow in. I feel that the fault may be as much with our whole society as with these young people. 6. From the passage we know that many British people are confused about (). A. the cause of juvenile crimes B. the rise of the crime rate C. the problem of crimes in their country D. the various kinds of juvenile delinquency 7. One reason why young people in large cities are more likely to commit crimes is that (). A. nobody knows anything about others B. they are free to move C. they live a better life D. they need more money 8. According to the passage, which groups of the following young people are LEAST likely to commit crimes？ A. Those living in big cities B. Those who are in need of help C. Those who are very poor D. Those living in the countryside 9. Unlike many others, the author holds that one important cause for juvenile delinquency is that(). A. young people nowadays do not like adult world B. young people in Britain today are freer than before C. too many young people have come to live in big cities D. young people are influenced by crime and violence in films and newspapers 10.According to the passage, which is to blame for juvenile crimes, apart from the young people themselves？ A. The adult world B. Their parents C. The development of the cities D. The society

A．it is a second order reaction B．it is a slow reaction C．it is a second order reaction to B D．it is a second order reaction to A