单项选择题

The underlined word "officials" (Para. 4) most probably refers to ______.

A．the researchers involved in the experiment
B．the inspectors of the football tournament
C．the referees of the football tournament
D．the observers at the site of the experiment
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单项选择题
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 of football refereeing
D．reexamine the rules for football refereeing
单项选择题
What is one of the possible conclusions of the experiment
A．The ideal retirement age for an experienced football referee is 45.
B．Age should not be the chief consideration in choosing a football referee.
C．A football referee should be as young and energetic as possible.
D．An experienced football referee can do well even when in poor physical condition.
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