单项选择题

What is the main topic of the conversation

A. The conversion of volcanic waste to fertilizer.
B. The menace of currently dormant volcanoes around Mount Saint Helens.
C. The eruption of Mount Saint Helens and its effects on the environment.
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What kind of career is the man interested in
A． Publishing.
B． Education.
C． Aviation.
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Which of the following do computers and high-tech tools NOT do in training American athletes
A． Analyze performance.
B． Suggest ways to improve.
C． Eliminate the competition
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