41.The most thrilling explanation is,unfortunately,a little defective. Some economists argue that powerful structural changes in the world have upended the old economic models that were based upon the historical link between growth and inflation.

　　42.The Aswan Dam,for example,stopped the Nile flooding but deprived Egypt of the fertile silt that floods left-all in return for a giant reservoir of disease which is now so full of silt that it barely generates electricity.

　　43.New ways of organizing the workplace——all that re-engineering and downsizing——are only one contribution to the overall productivity of an economy,which is driven by many other factors such as joint investment in equipment and machinery,new technology,and investment in education and training.

　　44.His colleague,Michael Beer,says that far too many companies have applied re-engineering in a mechanistic fashion,chopping out costs without giving sufficient thought to long-term profitability.

　　45.Defenders of science have also voiced their concerns at meetings such as The Flight from Science and Reason,held in New York City in 1995,and Science in the Age of （Mis）information,which assembled last June near Buffalo.

　　46.A survey of news stories in 1996 reveals that the antiscience tag has been attached to many other groups as well,from authorities who advocated the elimination of the last remaining stocks of smallpox virus to Republicans who advocated decreased funding for basic research.

　　47.The\'true enemies of science,argues Paul Ehrllch of Stanford University,a pioneer of environmental studies,are those who question the evidence supporting global warming,the depletion of the ozone layer and other consequences of industrial growth.

　　48.This development——and its strong implication for US politics and economy in years ahead——has enthroned the South as America\'s most densely populated region for the first time in the history of the nation\'s head counting.

　　49.Often they choose——and still are choosing——somewhat colder climates such as Oregon,Idaho and Alaska in order to escape smog crime and other plagues of urbanization in the Golden State.

　　50.As a result,California\'s growth rate dropped during the 1970\'s,to 18.5 percent——little more than two thirds the 1960\'s growth figure and considerably below that of other Western states.

　　51.Unlike most of the world\'s volcanoes,they are not always found at the boundaries of the at drifting plates that make up the earth\'s surface;on the contrary,many of them lie deep in the interior of a plate.

　　52.The relative motion of the plates carrying these continents has been constructed in detail,but the motion of the plates with respect to another cannot readily be translated into motion with respect to the earth\'s interior.

　　53.Wearing a seat belt saves lives;it reduces your chance of death or serious injury by more than half.

　　54.While warnings are often appropriate and necessary——the dangers of drug interactions,for example——and many are required by state or federal regulations,it isn\'t clear that they actually protect the manufacturers and sellers from liability if a customer is injured.

　　55.At the same time,the American Law Institute——a group of judges,lawyers,and academics whose recommendations carry substantial weight——issued new guidelines for tort law stating that companies need not warn customers of obvious dangers or bombard them with a lengthy list of possible ones.

　　56.In the past year,however,software companies have developed tools that allow companies to push information directly out to consumers,transmitting marketing messages directly to targeted customers.

　　57.The examples of Virtual Vineyards,Amazon.com,and other pioneers show that a Web site selling the right kind of products with the right mix of interactivity,hospitality,and security will attract online customers.

　　58.An invisible border divides those arguing for computers in the classroom on the behalf of students\'career prospects and those arguing for computers in the classroom for broader reasons of radical education reform.

　　59.Rather,we have a certain conception of the American citizen,a character who is incomplete if he cannot competently access how his livelihood and happiness are affected by things outside of himself.

　　60.Besides,this is unlikely to produce the needed number of every kind of professional in a country as large as ours and where the economy is spread over so many states and involves so many international corporations.

　　61.But,for a small group of students,professional training might be the way to go since well-developed skills,all other factors being equal,can be the difference between having a job and not.

　　62.Declaring that he was opposed to using this unusual animal husbandry technique to clone humans,he ordered that federal funds not be used for such an experiment-although no one had proposed to do so——and asked an independent panel of experts chaired by Princeton President Harold Shapiro to report back to the White House in 90 days with recommendations for a national policy on human cloning.(责任编辑：wotersion)