The experiment conducted by the researcher was meant to ____

The experiment conducted by the researcher was meant to _______.
A.set a standard for football refereeing
B.reexamine the rules for football refereeing
C.review the decisions of referees at the 1998 World Cup
D.analyze the causes of errors made by football referees
满分：4 分
2).The number of refereeing errors in the experimental matches was _______.
A.quite unexpected
B.as high as in a standard match
C.slightly above average
D.higher than in the 1998 World Cup
满分：4 分
3).The findings of the experiment show that _______.
A.the more slowly the referee runs,the more likely will errors occur
B.errors are less likely when a referee stays in one spot
C.errors are more likely when a referee keeps close to the ball
D.the farther the referee is from the incident,the fewer the errors
满分：4 分
4).The word "officials" (Line 2,Para.4) most probably refers to _______.
A.the referees of the football tournament
B.the observers at the site of the experiment
C.the researchers involved in the experiment
D.the inspectors of the football tournament
满分：4 分
5).What is one of the possible conclusions of the experiment?
A.A football referee should be as young and energetic as possible.
B.An experienced football referee can do well even when in poor physical condition.
C.The ideal retirement age for an experienced football referee is 45.
D.Age should not be the chief consideration in choosing a football referee.