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Questions 32 to 35 are based on the passage you have just heard.

A．Desert and Ice—a Hot Topic.
B．Rivers and Oceans—a Hot Topic.
C．Melting Ice—a Hot Topic.
D．Trees and Forest—a Hot Topic.

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Questions 32 to 35 are based on the passage you have just heard. 您的浏览器不支持 audio 元素。