82. According to the author, the trouble for the technological advances of America is that
　　A. their enemies can quickly imitate their weapons.
　　B. their allies are unable to produce the same kind of weapons.
　　C. many other countries are not financially capable of producing weapons that are in line with American weapons.
　　D. their enemies may come up with other dangerous weapons.

　　83. The trouble, according to the passage, for American to increase its military power is that
　　A. its allies may not be able to follow the American way of attacking other countries.
　　B. America may lose its allies for one reason or another.
　　C. America has to withdraw their armies from Asia and other areas.
　　D. America's rivals can use the same kind of weapons to attack America.

　　Questions 84-90 are based on the following passage.
　　Imagine a society in which cash no longer exists. Instead "cash" is electronic, as in bank-card systems. Currency and coin are abandoned.
　　The immediate benefits would be profound and fundamental. Theft of cash would become impossible. Bank robberies and cash-register robberies would simply cease to occur. Attacks on shopkeepers, taxi drivers, and cashiers would all end. Purse snatchings would become a thing of the past. Urban streets would become safer. Retail shops in once-dangerous areas could operate in safety. Security costs and insurance rates would fall. Property values would rise. Neighborhoods would improve.
　　Drug traffickers and their clients, burglars and receivers of stolen property, arsonists for hire, and bribe-takers would no longer have the advantage of using untraceable currency. Electronic "money" would leave incriminating trails of data, resulting in more arrests and convictions. These prosecutions, in turn, would inhibit further crimes.
　　The impact of the monetary change on underground economies would be nearly as dramatic as the effect on crime. In the United States, the underground economy is estimated at between 10% and 28% of the gross national product. Internal Revenue Service (IRS) researches suggest that almost all hidden labor is paid in currency.
　　In a society devoid of physical money, a change from cash to recorded electronic money would be accompanied by a flow of previously unpaid income-tax revenues running in the tens of billions of dollars. As a result, income-tax rates could be lowered and the national debt reduced.
　　Cash has been the root of much social and economic evil. The emergence of electronic funds-transfer technology makes it possible to change the nature of money and to divorce it from evil. Eighty percent of Americans regularly use cred

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