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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单项选择题
Computers and high-tech tools did all the following for American athletes EXCEPT_________.
A．analyzing their performances
B．suggesting ways to improve
C．identifying their weaknesses
D．improving their performances easily
单项选择题
If you are working in a warm —color surrounding, which of the following is most likely to happen
A．Severe headache.
B．Low blood pressure.
C．Rapid heartbeat.
D．Breathing difficulty.
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