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能够唯一标识表中每条记录的字段称为_________。

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Questions 61-67 are based on the following passage. Sports is one of the world’s largest industries, and most athletes are professionals who are paid for their efforts. Because an athlete succeeds by achievement only--not by economic background or family connections--sports can be a fast route to wealth, and many athletes play more for money than for love. This has not always been true. In the ancient Olympics the winner got only a wreath of leaves (花冠). Even though the winners became national heroes, the games remained amateur for centuries. Athletes won fame, but no money. As time passed, however, the contests become increasingly less amateur and cities began to hire athletes to represent them. By the fourth century A.D., the Olympics were ruined, and they were soon ended. In 1896, the Olympic Games were revived with same goal of pure amateur competition. The rules bar athletes who have ever received a $50 prize or an athlete scholars or who have spent for weeks in a training camp. At least one competitor in the 1896 games met these qualifications. He was Spiridon Loues, a water carrier who won the marathon race. After race, a rich Althenian offered him anything he wanted. A true amateur, Loues accepted only a cart and a horse. Then he gave up running forever. But Loues was an exception and now, as the Chairman of the German Olympic Committee said, "Nobody pays any attention to these rotes." Many countries pay their athletes to train year-round, and Olympic athletes are eager to sell their names to companies that make everything from ski equipment to fast food. Even the games themselves have become a huge business. Countries fight to hold the Olympics not only for honor, but for money. In 1972 games in Munich cost the German 545 million dollars, but by selling medal symbols, TV rights, food, drink, hotel rooms, and souvenirs, they managed to make a profit. Appropriately, the symbols of victory in the Olympic Games is no longer a simple olive wreath--it is a gold medal. By the fourth century A.D., Olympic contests became increasingly more ______, thus mining the Olympics.

Questions 68-73 are based on the following passage. Normally a student must attend a certain number of courses in order to graduate, and each course which he attends gives him a credit which he may count towards a degree. In many American universities the total work for a degree consists of thirty-six courses each lasting for one semester. A typical course consists of three classes per week for fifteen weeks; while attending a university a student will probably attend four or five courses during each semester. Normally a student would expect to take four years attending two semesters each year. It is possible to spread the period of work for the degree over a longer period. It is also possible for a student to move between one university and another during his degree course, though this is not in fact done as a regular practice. For every course that he follows a student is given a grade, which is recorded, and the record is available for the student to show to prospective employers. All this imposes a constant pressure and strain of work, but in spite of this some students still find time for great activity in student affairs. Elections to positions in student organizations arouse much enthusiasm. The effective work of maintaining discipline is usually performed by students who advise the academic authorities. Any student who is thought to have broken the rules, for example, by cheating has to appear before a student court. With the enormous number of students, the operation of the system does involve a certain amount of activity. A student who has held one of these positions of authority is much respected and it will be of benefit to him later in his career. ______ Normally a student would at least attend 20 classes each week.

虽然对如何治理国家，两位政治候选人会有不同的想法，但他们在竞选中所花的钱常常一样多。

Questions 61-67 are based on the following passage. Sports is one of the world’s largest industries, and most athletes are professionals who are paid for their efforts. Because an athlete succeeds by achievement only--not by economic background or family connections--sports can be a fast route to wealth, and many athletes play more for money than for love. This has not always been true. In the ancient Olympics the winner got only a wreath of leaves (花冠). Even though the winners became national heroes, the games remained amateur for centuries. Athletes won fame, but no money. As time passed, however, the contests become increasingly less amateur and cities began to hire athletes to represent them. By the fourth century A.D., the Olympics were ruined, and they were soon ended. In 1896, the Olympic Games were revived with same goal of pure amateur competition. The rules bar athletes who have ever received a $50 prize or an athlete scholars or who have spent for weeks in a training camp. At least one competitor in the 1896 games met these qualifications. He was Spiridon Loues, a water carrier who won the marathon race. After race, a rich Althenian offered him anything he wanted. A true amateur, Loues accepted only a cart and a horse. Then he gave up running forever. But Loues was an exception and now, as the Chairman of the German Olympic Committee said, "Nobody pays any attention to these rotes." Many countries pay their athletes to train year-round, and Olympic athletes are eager to sell their names to companies that make everything from ski equipment to fast food. Even the games themselves have become a huge business. Countries fight to hold the Olympics not only for honor, but for money. In 1972 games in Munich cost the German 545 million dollars, but by selling medal symbols, TV rights, food, drink, hotel rooms, and souvenirs, they managed to make a profit. Appropriately, the symbols of victory in the Olympic Games is no longer a simple olive wreath--it is a gold medal. What do most athletes of today go after