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 for football refereeing
D．reexamine the rules for football refereeing
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单项选择题
As indicated in the passage, the water problem ______.
A．has been exaggerated by some experts in the field
B．is underestimated by government organizations at different levels
C．poses a challenge to the technology of building reservoirs
D．is already serious in certain parts of the world.
单项选择题
The number of refereeing errors in the experimental matches was______.
A．slightly above average
B．higher than in the 1998 World Cup
C．quite unexpected
D．as high as in a standard match
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