题目内容
The author is most concerned with the possibility that after a few decades__________．
查看答案
搜索结果不匹配？点我反馈
更多问题
阅读材料，回答题。
The New Technology Application
On a more mundane level, third-generation mobile telephones, despite all the delays and the billions squandered on 3G licenses by telecom firms, are still expected to offer consumers high-speed, always on mobile internet access, complete with video, in the next few years.Rapidly proliferating "WiFi" networks already offer wireless access on a local basis. Tiny tracking chips called radio-frequency identification devices are being used as pet passports.Soon they will be small, powerful and cheap enough to be implanted into everything form. humans to milkcartons recording and transmitting real-time medical data, or serving as a form. of inventory control.Sensors of every kind, including video cameras, should also become much smaller and cheaper.Forrester Research, a technology consultancy, predicts that 14 billion such devices will be connected to the internet by 2005.
How rapidly such new technology is introduced will depend on a number of factors the state of the economy, the supply of investment capital and the appetite of consumers for new products or services ! Fortunes will be made and lost many times over.But whatever happens, the power of computing and communications look set to continue to grow, and its price to fall, at a steady rate for the next few decades.That will make it possible, at least in rich countries, to record most human interactions, wherever and whenever they take place, and to store and analyze this ocean of data at low cost.
For the sake of argument, this survey will assume that we are heading towards a networked society of ubiquitous, mobile Communication capable of constant monitoring.Whether this arrives in 20,30 or 40 years does not really matter.The point is that the destination seems not merely possible, but probable, so it is not too
soon to ask: What do we want this technology to do？
The internet has already thrown up a host of legal and political conundrums, but, these are only a small foretaste of the dilemmas about privacy, security, intellectual property and the nature of government itself that will have to be faced over the coming decades.The debate has already begun. This survey will outline some of main issues, and speculate on the way they are likely to go.
Radio-frequency identification devices__________. 查看材料
The advantage for computers in chess lies in__________.
阅读材料，回答题。
Artificial Intelligence
For years there have been endless articles stating that scientists are on the verge of achieving artificial intelligence and that it is just around the corner.The truth is that it may be just around the corner, but they haven&39;t yet found the fight block.
Artificial intelligence aims to build machines that can think. One immediate problem is to define thought,which is harder than you might think.The specialists in the field of artificial intelligence complain, with some justification, that anything that their machines do is dismissed as not being thought. For example, computer now plays very, very good chess.
They can&39;t beat the greatest players in the world, but they can beat just about anybody else.If a human being played chess at this level, he or she would certainly be considered smart.Why not a machine？ The answer is that the machine doesn&39;t do anything clever in playing chess. It uses its blinding speed to do a brute force search of all possible moves for several moves ahead, evaluates the outcomes and picks the best.Human don&39;t play chess that way.They see patterns, while computers don&39;t.
This wooden approach to thought characterizes machine intelligence.Computers have no judgment, no common sense.So-called expert systems, one of the hottest areas in artificial intelligence aims to mimic the reasoning processes of human experts in a limited field, such as medical diagnosis or weather forecasting.There may be limited commercial applications for this sort of thing, but there is no way to make a machine that can think about anything under the sun, which a teenager can do.
The hallmark of artificial intelligence to date is that if a problem is severely restricted, a machine can achieve limited success.But when the problem is expanded to a realistic one computers fall fiat on their display screens.For example.machines can understand a few words spoken individually by a speaker that they have been trained to hear.They cannot understand continuous speech using an unlimited vocabulary spoken by just any speaker.
According to the passage， we know that the writer__________. 查看材料
阅读材料，回答题。
How does Organisms Ward off Invaders
The livelihood of each species in the vast and intricate assemblage of living things depends on the existence of other organisms．This interdependence is sometimes subtle，some times obvious．Perhaps the most straightforward dependence of one species on another occurs with parasites，organisms that live on or in other living things and derive nutrients directly from them．The parasitic way of life is widespread．A multitude of microorganisms(including viruses and bacteria，and an army of invertebrates or creatures lacking a spinal column(including crustaceans，insects，and many different types of worms)make their livings directly at the expense of other creatures．In the face of this onslaught，living things have evolved a variety of defense mechanisms for protecting their bodies from invasion by other organisms．
Certain fungi and even some kinds of bacteria create substances known as antibiotics into their external environment．These substances are capable of killing or inhibiting the growth of various kinds of bacteria that also occupy the area，thereby eliminating or reducing the competition for nutrients．The same principle is used in defense against invaders in other groups of organisms．For example，when attacked by disease--causing fungi or bacteria，many kinds of plants produce chemicals that help to ward off the invaders．
Members of the animal kingdom have developed a variety of defense mechanisms for dealing with parasites．Although these mechanisms vary considerably，all major groups of animals are capable of detecting and reacting to the presence of“foreign”cells．In fact，throughout the animal kingdom from sponges to certain types of wornls shellfish，and all vertebrates(creatures possessing spinal column)
there is evidence that transplants of cells or fragments of tissues into an animal are accepted only if they come from genetically compatible or closely related individuals．
The ability to distinguish between“self”and“non-self”，while present in all animals，is most efficient among vertebrates，which have developed an immune system as their defense mechanism．The immune system recognizes and takes action against foreign invaders and transplanted tissues that are treated as foreign cells．
What does the passage mainly discuss？ 查看材料
微信支付 
支付宝支付