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（38）是把对象的属性和服务结合成一个独立的系统单元，并尽可能隐藏对象的内部细节：（39）是指子类可以自动拥有父类的全部属性和服务；（40）是对象发出的服务请求，一般包含提供服务的对象标识、服务标识、输入信息和应答信息等。 （38）处填（）。
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Question 41-44Saudi Arabia, OPEC’s cautious giant, understands all this. When Bill Clinton met Saudi Arabia’s Crown Prince Abdullah this week, Mr. Clinton argued for an output rise big enough to put an end to these painful prices. Prince Abdullah has promised to “make every effort to ensure equilibrium in the oil markets and to stabilise prices.” This week he revealed that Saudi Arabia has been quietly leaking an extra 600,000 barrels per day (bpd) on to the market since July in an effort to cool prices. .If that is true, it just goes to show that managing the oil markets is easier said than done. Despite several Saudi-inspired output increases by the cartel in recent months, the price has remained stubbornly high; this week, it soared to nearly $35 a barrel, the highest since theGulf war in 1990. As the cartel’s oil ministers gather in Vienna on September 10th to hammer out new production quotas, they are once again under intense pressure to release more oil, and fast. To hear OPEC members talk, you might think that serious price relief is on the way. There is discussion of “managing” prices down through a newish price mechanism. At the cartel’s meeting in March, ministers quietly agreed a grand new plan to keep oil within a target band of $22-28 a barrel. If the price of a basket of seven OPEC crudes stays below $22 for 20 trading days, the cartel is supposed to cut production by 500,000 barrels a 0ay. If it stays above $28 for 20 trading days, it will automatically raise production by the same amount. This price band has become the main topic of discussion in advance of the upcoming gathering of ministers. Prince Abdullah even talks of a return to a stable market within months. Oil traders and analysts note that the 20-day limit looks likely to be triggered again this week. A new report by Lehman Brothers, an investment bank, echoes the view of many: “Our expectation is that production will be increased by 500,000 bpd, either through the price mechanism or through a separate agreement.” When it released new figures suggesting that domestic oil-stock levels are lower than previously thought, the American government’s Energy Information Administration added that it too expects an increase of that size. Adding support to this theory are mumblings from OPEC delegates in support of the mechanism. Two decades ago, in the year of the cartel’s 20th birthday celeb rations, ministers gathered in Indonesia to hammer out details of a clever new scheme: a mechanism whereby the price of oil would be fixed, and adjusted every quarter automatically for such factors as inflation and currency fluctuations. Members had agreed on the ambitious plan, except for one crucial detail: at what price to start this price-peg crawling. The cautious Saudis, the self-proclaimed guardians of the oil market, wanted a price below $30 a barrel; the hawks in the cartel, unconcerned about consumers’ pain, demanded a much higher price. The ensuing bickering ensured that the scheme collapsed. History may now be repeating itself. When the current price-stabilization scheme was first unveiled, punters with short memories placed big bets that the cartel would adhere to it. By mid-June, the price basket had sailed past the 20-day upper trigger. But OPEC did not “automatically” release 500,000 barrels. Various confused and contradictory explanations surfaced from ministers, but not the oil. Only at their next officially scheduled meeting did they come up with a meager quota increase. How many oil price schemes were recommended by OPEC ministers according to the passage
为了在健康人群中发现可疑的乙性肝炎感染者宜用（）。
小区物业收取进出车辆管理费，业主认为已经缴纳物业费，不应该缴纳管理费，物业就催缴、给车子上锁，你是街道管理人员，怎么处理？
Question 45-48 The horse preceded man on earth. Although the earliest remains of primitive horses have been found on the North American continent, many scientist believe this small species traveled over a land mass in the Bering Sea to found the beginnings of the modern horse in Asia. It became extinct in America. Other scientists believe that the horse may have originated in Asia. In any event the animal soon spread into China, Europe, and the Middle East. The first modern horses to be introduced into the American continent came with the early Spanish explorers. Horses were bred into many types. The heavy horses developed in the low countries of Europe and were used for Arabian. The only true wild horses left in the 20th century are found in Mongolia. Horses are said to rate in intelligence after the ape, elephant, and dog. They have excellent memories and can sometimes find their way home when lost, and sense danger better that their masters. The early civilizations of man that had made use of ht horse developed more rapidly than those which did not. The primary uses of the horse for early man were ___________
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