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
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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.
单项选择题
The purpose of the Frederick Ⅱ's experiment was ______.
A．to prove that children are born with the ability to speak
B．to discover what language a child would speak without hearing any human speech
C．to find out what role careful nursing would play in teaching a child to speak
D．to prove that a child would be damaged without learning a language
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