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Questions 15 ～ 18 are based on the following conversation.
How many years has it been since the last outbreak of foot-and-month disease in South Africa

A．Over 40 years.
B．Over 20 years.
C．Over 30 years.
D．Over 50 years.

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单项选择题

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Questions 15 ～ 18 are based on the following conversation. How many years has it been since the last outbreak of foot-and-month disease in South Africa 您的浏览器不支持 audio 元素。