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从感性认识向理性认识飞跃的条件是()。
A．感性材料十分丰富B．感性材料合乎实际C．感性材料的大量积累D．用辩证的思维方式对感性材料进行加工E．感性材料不一定真实
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A．规模报酬有关B．外部经济与不经济有关C．要素的边际报酬变动有关D．固定成本与可变成本所占比重有关 -
On a weekday night this January, thousands of flag-waving youths packed Olaya Street, Riyadh"s main shopping strip, to cheer a memorable Saudi victory in the GCC Cup football final. One car, rock music blaring from its stereo, squealed to a stop, blocking an intersection. The passengers leapt out, clambered on to the roof and danced wildly in front of the honking crowd. Having paralyzed the traffic across half the city, they sped off before the police could catch them.Such public occasion was once unthinkable in the rigid conformist kingdom, but now young people there and in other Gulf States are increasingly willing to challenge authority. That does not make them rebels: respect for elders, for religious duty and for maintaining family bonds remain preeminent values, and premarital sex is generally out of the question. Yet demography is beginning to put pressure on ultra-conservative norms.After all, 60% of the Gulf"s native population is under the age of 25. With many more of its citizens in school than in the workforce, the region faces at least a generation of rocketing demand for employment. In every single GCC country the native workforce will double by 2020. In Saudi Arabia it will grow from 3.3m now to over Sm. The task of managing this surge would be daunting enough for any society, but is particularly forbidding in this region, for several reasons.The first is that the Gulf suffers from a lopsided labor structure. This goes back to the 1970s, when ballooning oil incomes allowed governments to import millions of foreign workers and to dispense cozy jobs to the locals. The result is a two-tier workforce, with outsiders working mostly in the private sector and natives monopolizing the state bureaucracy. Private firms are as productive as any. But within the government, claims one study, workers are worth only a quarter of what they get paid.Similarly, in the education sector, 30 years spent keeping pace with soaring student numbers has taken a heavy toll on standards. The Saudi school system, for instance, today has to cope with 5m students, eight times more than in 1970. And many Gulf countries adapted their curricula from Egyptian models that are now thoroughly discredited. They continue to favor rote learning of "facts" intended to instill patriotism or religious values.Even worse, the system as a whole discourages intellectual curiosity. It channels students into acquiring prestige degrees rather than gaining marketable skills. Of the 120,000 graduates that Saudi universities produced between 1995 and 1999, only 10,000 had studied technical subjects such as architecture or engineering. They accounted for only 2% of the total number of Saudis entering the job market.The wild behavior. depicted in the first paragraph is intended to ______.
A．advocate traditional values in Saudi.B．introduce the change of Saudi youths.C．criticize their nonconformist image.D．praise Saudi youth tactical retreat. -
若处理器有32位地址，则它的虚拟地址空间为()字节。
A．2GB．4GC．100KD．640K -
In the author"s view, many endangered languages are
A．remarkably well-kept in this modern worldB．exceptionally powerful tools of communicationC．quite possible to be revived instead of dying outD．a unique way of bringing different groups together -
Every second, 1 hectare of the world"s rainforest is destroyed. That"s equivalent to two football fields. An area the size of New York City is lost every day. In a year, that adds up to 31 million hectares—more than the land area of Poland. This alarming rate of destruction has serious consequences for the environment; scientists estimate, for example, that 137 species of plant, insect or animal become extinct every day due to logging. In British Columbia, where, since 1990, thirteen rainforest valleys have been clear cut, 142 species of salmon have already become extinct, and the habitats of grizzly bears, wolves and many other creatures are threatened. Logging, however, provides jobs, profits, taxes for the government and cheap products of all kinds for consumers, so the government is reluctant to restrict or control it.Much of Canada"s forestry production goes towards making pulp and paper. According to the Canadian Pulp and Paper Association, Canada supplies 34% of the world"s wood pulp and 49% of its newsprint paper. If these paper products could be produced in some other way, Canadian forests could be preserved. Recently, a possible alternative way of producing paper has been suggested by agriculturalists and environmentalists: a plant called hemp.Hemp has been cultivated by many cultures for thousands of years. It produces fiber which can be made into paper, fuel, oils, textiles, food, and rope. For many centuries, it was essential to the economies of many countries because it was used to make the ropes and cables used on sailing ships; colonial expansion and the establishment of a world wide trading network would not have been possible without hemp. Nowadays, ships" cables are usually made from wire or synthetic fibres, but scientists are now suggesting that the cultivation of hemp should be revived for the production of paper and pulp. According to its proponents, four times as much paper can be produced from land using hemp rather than trees, and many environmentalists believe that the large-scale cultivation of hemp could reduce the pressure on Canada"s forests.However, there is a problem: hemp is illegal in many countries of the world. This plant, so useful for fiber, rope, oil, fuel and textiles, is a species of cannabis, related to the plant from which marijuana is produced. In the late 1930s, a movement to ban the drug marijuana began to gather force, resulting in the eventual banning of the cultivation not only of the plant used to produce the drug, but also of the commercial fiber-producing hemp plant. Although both George Washington and Thomas Jefferson grew hemp in large quantities on their own land, any American growing the plant today would soon find himself in prison—despite the fact that marijuana cannot be produced from the hemp plant, since it contains almost no THC(the active ingredient in the drug).In recent years, two major movements for legalization have been gathering strength. One group of activists believes that all cannabis should be legal—both the hemp plant and the marijuana plant—and that the use of the drug marijuana should not be an offense. They argue that marijuana is not dangerous or addictive, and that it is used by large numbers of people who are not criminals but productive members of society. They also point out that marijuana is less toxic than alcohol or tobacco. The other legalization movement is concerned only with the hemp plant used to produce fiber; this group wants to make it legal to cultivate the plant and sell the fiber for paper and pulp production. This second group has had a major triumph recently: in 1997, Canada legalized the farming of hemp for fiber. For the first time since 1938, hundreds of farmers are planting this crop, and soon we can expect to see pulp and paper produced from this new source.Logging is not banned chiefly because
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