题目内容
（请给出正确答案）
[主观题]
A．Desert and Ice—a Hot Topic.B．Rivers and Oceans—a Hot Topic.C．Melting Ice—a Hot Topic
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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