单项选择题

According to the third paragraph, improper calls on the football field ______.

A．are evidence of corruption by some officials
B．are increased by the higher speed of the game
C．result from reduced proficiency of referees
D．are caused by anything other than human error
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单项选择题
The best way to save the coming World Cup is to ______.
A．settle the scandals before the world event begins
B．keep a tight reign on referees to make just calls
C．deliver thorough investigations into participants
D．apply technological innovation to help decide results
单项选择题
What do referees think of a balls-and-strikes calling machine in baseball games
A．They doubt on its accuracy in judging games.
B．They think it unnecessary to use such machine.
C．They don't care whether the machine is in use or not.
D．They find it helpful to make more satisfactory calls.
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