单项选择题

A．Global warming in Antarctica.
B．Penguins in Antarctica.
C．Tourism in Antarctica.
D．Environmental protection in Antarctica.
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单项选择题
A．Before 8 p.m.B．After 8 p.m.C．Before 9 a.m.D．Between 9 and 9:30 a.m.
A．Before 8 p.m.
B．After 8 p.m.
C．Before 9 a.m.
D．Between 9 and 9:30 a.m.
填空题
higher。[解析] 推断题。录音中提到“Compared to non-runners, he says, runners showed 30 percent lower risk of death by any causes.”，即Non-runners have 30% higher risk of death。
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