单项选择题

This passage is mainly about_________.

A．sharks in the southeast Australia
B．precautions against sharks
C．how a man became rich due to his bravery
D．the victims of sharks
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单项选择题
According to the passage, the electronic message system_________.
A．trained American athletes
B．kept the journalists informed of the results
C．controlled the traffic efficiently
D．helped the judges make final decisions
单项选择题
What is the passage mainly about
A．The 23rd Olympic Games.
B．A race of high technology.
C．The application of high technology to the Olympics.
D．A sophisticated computer system.
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