单项选择题

Questions 18～21 are based on the following dialogue on sports.
What is the speaker’s main topic

A．Training for a professional athlete.
B．His physical training.
C．How to do cross-country running.
D．How to do mountain climbing.

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单项选择题

Questions 18～21 are based on the following dialogue on sports. What is the speaker’s main topic 您的浏览器不支持 audio 元素。