单项选择题

A．Beginning.
B．Intermediate.
C．Advanced.
D．It"s hard to say.
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reducing。[解析] 信息题。录音中提“...speed, distance and how often one runs made little difference in reducing the risk of death.”。不同的跑步的速度、距离、频率在降低死亡危险方面并没有什么大的区别。
单项选择题
A．Global warming in Antarctica.B．Penguins in Antarctica.C．Tourism in Antarctica.D．Environmental protection in Antarctica.
A．Global warming in Antarctica.
B．Penguins in Antarctica.
C．Tourism in Antarctica.
D．Environmental protection in Antarctica.
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