单选题：What will happen if whale numbers drop to a certain degree?

题目分类：英语六级
题目类型：单选题
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题目内容：

What will happen if whale numbers drop to a certain degree? A．The number will bounce back at a certain point.
B．Whales begin to adapt to new living conditions.
C．The extinction of whales becomes unavoidable.
D．A biological disaster will come to the earth.

参考答案：

答案解析：

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