单项选择题

Passage one Questions 26 to 28 are based on the passage you have just heard.

A．control of natural hazards
B．control of heavy traffic
C．control of heart disease
D．control of man-made hazards

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单项选择题

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Passage one Questions 26 to 28 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。