to their team. a researcher was appointed to study the performance of some top referees. The researcher organized an experimental tournament(锦标赛) involving four youth teams. Each match lasted an hour divided into three periods of 20 minutes during which different referees were in arge Observers noted down the referees'errors of which there were 61 over the tournament converted to a standard match of 90 minutes each referee made almost 23 mistakes, a remarkably high number. The researcher then studied the videotapes to analyse the matches in detail. Surprisingly, he found that errors were more likely when the referees were close to the incident. When the officials got it right, they were on average, 17 meters away from the action. The average distance in the case of errors was 12 meters The research shows the optimum(最佳的) distance is about20 meters There also seemed to be an optimum speed. Correct decisions came when the referees were moving at a speed of about 2 meters per second. The average speed for errors was 4 meters per second If FIFA, football's international ruling body wants to improve the standard of refereeing at the next World Cup it should encourage referees to keep their eyes on the action from a distance, rather than rushing to keep up with the ball the researcher argues. He also says that FIFA's insistence that referees should retire at age 5 may be misguided. If keeping up with the action is not so important, their physical condition is less critical. 51. The experiment conducted by the researcher was meant to A )review the decisions of referees at the 1998 World Cup B analyse the causes of errors made by football referees c) set a standard for football refereeing D reexamine the rules for football refereeing 52. The number of refereeing errors in the experimental matches was A)slightly above average Higher than in the 1998 World Cup c) quite unexpected D)as high as in a standard match 53. The findings of the experiment show that A) errors are more likely when a referee keeps dose to the ball B the farther the referee is from the incident, the fewer the errors c) the more slowly the referee runs, the more likely will errors occur Errors are less likely when a referee stays in one spot 54. The word officials"(Line 2, Para. 4) most probably refers toto their team. A researcher was appointed to study the performance of some top referees. The researcher organized an experimental tournament (锦标赛) involving four youth teams. Each match lasted an hour, divided into three periods of 20 minutes during which different referees were in charge. Observers noted down the referees’ errors, of which there were 61 over the tournament. Converted to a standard match of 90 minutes, each referee made almost 23 mistakes, a remarkably high number. The researcher then studied the videotapes to analyse the matches in detail. Surprisingly, he found that errors were more likely when the referees were close to the incident. When the officials got it right, they were, on average, 17 meters away from the action. The average distance in the case of errors was 12 meters. The research shows the optimum (最佳的) distance is about 20 meters. There also seemed to be an optimum speed. Correct decisions came when the referees were moving at a speed of about 2 meters per second. The average speed for errors was 4 meters per second. If FIFA, football’s international ruling body, wants to improve the standard of refereeing at the next World Cup, it should encourage referees to keep their eyes on the action from a distance, rather than rushing to keep up with the ball, the researcher argues. He also says that FIFA’s insistence that referees should retire at age 45 may be misguided. If keeping up with the action is not so important, their physical condition is less critical. 51. The experiment conducted by the researcher was meant to ________. A) review the decisions of referees at the 1998 World Cup B) analyse the causes of errors made by football referees C) set a standard for football refereeing D) reexamine the rules for football refereeing 52. The number of refereeing errors in the experimental matches was ________. A) slightly above average B) higher than in the 1998 World Cup C) quite unexpected D) as high as in a standard match 53. The findings of the experiment show that ________. A) errors are more likely when a referee keeps close to the ball B) the farther the referee is from the incident, the fewer the errors C) the more slowly the referee runs, the more likely will errors occur D) errors are less likely when a referee stays in one spot 54. The word “officials” (Line 2, Para. 4) most probably refers to ________