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假定有下列程序段 For i=1 TO 3 For j=5 TO 1 Step-1 Print i*j Next j Next i 则语句Print i*j的执行次数是( )。
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假定通过复制、粘贴操作建立了一个命令按钮数组Command1，下列说法中错误自是( )。
The history of the American people is, (76) , the history of the movement of the American people. They moved from the colonies of the East Coast to the open space of the (77) . They moved from the country and the farm to the city. (78) , Americans have been moving from the cities to the suburbs.Pioneer Americans began (79) from the East Coast to the West 250 years ago. They moved west for many reasons. (80) reason was that they could obtain (81) open space and land (82) farming. Americans liked large open spaces, and they liked the freedom and independence to (83) the land in their own way. Some of the land became farms. Important minerals were discovered in some areas, so some of the land became (84) . Other large areas became cattle ranches. There seemed to be enough land for everybody. But it was a diffieuh (85) of endless work and hardship. 77().
窗体上有一个名称为Command1的命令按钮，其单击事件过程及有关函数过程如下： Private Sub Command1 Click() Dim n As Integer n=add(5，10) Print n End Sub Function add(v1 As Integer，v2 As Integer，Optiona1 v3)As Integer If Not IsMissing(v3)Then add=v1+v2+v3 Else add=v1+v2 End If End Function 运行程序，单击命令按钮，以下叙述中正确的是( )。
Long after the 1998 World Cup was won, disappointed fans were still cursing the disputed refereeing(裁判)decisions that denied victory, 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 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. The experiment conducted by the researcher was meant to ().
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