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通常计算机的存储器是一个由Cache、主存和辅存构成的3级存储系统。辅助存储器一般可由磁盘、磁带和光盘等存储设备组成。Cache和主存一般是一种 (5) 存储器。在各种辅存中，除了 (6) 外，大多是便于脱卸和携带的。Cache存储器一般采用 (7) 半导体芯片，主存现主要由 (8) 半导体芯片组成。
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The Great Depression spread from the US to the rest of the capitalist world, yet it affected the Americans the most. It gave (66) to the fear that such catastrophes would (67) (occur)or even that the American economy would live in a s (68) of permanent depression unless radical changes were m (69) in the economic system. The fear is now gone, partly because that analysis was judged faulty. Changes in institutions and policies that sta (70) the economy also helped to dispel those fears. People’s worry per (71) about the possibility of less severe, but still debilitating (使虚弱) , recessions, (72) But the experience of the postwar years has provided two lessons; First, the only serious recessions in which US unemployment rose to highs of 9 percent and 11 percent re (73) , came after fairly high inflation. Second, even recessions of that depth later on t (74) out to be less painful than had been expected because they were short. This was because the a (75) American worker had substantial assets, and was likely to he in a family with more than one worker. (76) remains as the chief uncertainty about the stability of the US economy is the possibility of inflation. This depends on whether the temptation of the short-term political advantages of inflationary policy can be resisted. The inflation rate in the United States was about 4.5 percent. The economy is much better ad (77) to such a rate now than it was in 1971, when that rate caused the (78) (position) of price controls. Unemployment in America was r (79) near 5.25 percent. That is somewhat higher than used to be considered full employment, but it is not a serious figure, as haft of the unemployed are out of work for five weeks or less, and the average d (80) of unemployment is about twelve weeks. The problem today is serious in that it most affects black youths, who are not being brought into the work force.
USB是一种串行总线规范，它支持设备热插拔，以菊花链方式最多可连接 (12) 个设备，设备间的连接电缆一般不能超过 (13) 。
Effective reading requires not only "reading between the lines," but also "writing between the lines. " There are two ways in which one can own a book. The first is to (21) for it. But the act of purchase is only the (22) to possession. Full (23) won’t come unless you have absorbed the ideas to do you any good. There are kinds of book owners. The first has all the (24) sets and best-sellers—unread and (25) . The second has a great many books, all of which as clean and shiny as the day they were bought. The third, however, has a collection of books that are all dog-eared and dilapidated. Marking up a book is (26) to reading. First, it keeps you awake. Second, active reading is (27) , which expresses itself in words. Finally, writing helps you remember the thoughts you had or the thoughts the author expressed. Light fictions like Gone with the Wind do not require active reading. They can be read in a state of (28) . But great books cannot be read while you’re asleep. There are a number of devices for marking a book intelligently and (29) For example, (30) , vertical lines at the margin, stars or asterisks at the margin, numbers in the margin, numbers of other pages in the margin and circling of key words or phrases.
The name Genghis Khan (成吉思汗) probably makes many people think of conquering warriors on horseback leaving burning cities and piles of dead bodies behind them. While there is no doubt that Genghis Khan was the leader of a highly efficient killing machine, there was much more to him than military skill. He was also a talented politician with excellent diplomatic abilities. In the ll60s, the tribes of the Central Asian Steppes were almost constantly at war with one another. In the middle of the chaos, one of the tribal leaders had a son named Temujin. When the boy was nine years old, his father was poisoned by enemies. The tribe then abandoned the family, leaving them to survive by eating rats and insects. Despite his difficult childhood, Temujin grew up strong enough to claim his hereditary position as tribal leader. He became adept at forming alliances, as well as fighting battles. By 1206, all the Mongol tribes were ready to recognize him as supreme leader. They gave him the title Genghis Khan, which means "emperor of all emperors. " Having united the tribes of Central Asia, Genghis Khan turned his attention elsewhere. His ambition was world conquest, and he advanced at an astonishing rate. He invaded northern China and captured Peking, but was unable to subdue the whole country. Instead, he turned westwards. By the time of his death in 1227, he had created an empire that stretched from the Pacific coast to the Caspian Sea. (82) The Mongols (蒙古人) were superb horsemen who won their victories with a technique of pretending to retreat, then launching a surprise attack. Their discipline and organization made them extremely effective fighters. They were expert archers and could maintain total control of their horses while keeping both hands free for fighting. Genghis Khan’s armies were divided into tightly organized units which were directed by an efficient signaling system using black flags. (83) Their favorite tactic in open battle involved provoking an attack, and scattering as the enemy came forward. The Mongols would harass the enemy from the sides until the latter were exhausted, then close in for the kill. (84) After capturing a city, Mongol armies would test the sincerity of the inhabitants’ surrender. They would pretend to go away, leaving behind a small number of representatives. If these were killed, the Mongols would return to murder the entire population. They seldom took prisoners. (85) Despite his ruthless methods, Genghis Khan was not an impulsive killer. He avoided battle if diplomacy would work, and he was skilled at using spies to help achieve his aims. He also maintained the tradition of choosing leaders in a mass meeting, and people under his rule were able to advance by ability rather than noble birth. For the citizens of modern-day Mongolia, Genghis Khan is a folk hero and a symbol of their emerging democracy. A main street in the capital of Ulan Bator has been named after him, and his image is on a banknote. He even has a brand of vodka named after him, not an unusual memorial for one of history’s greatest conquerors. Perhaps Genghis Khan would appreciate this more than his traditional reputation as a ruthless killer.
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