Scientists assume that unrestrained population growth and dwindling resources may force humans to look to the sea for food.

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问题 Scientists assume that unrestrained population growth and dwindling resources may force humans to look to the sea for food.

选项 A、unavoidable
B、unexpected
C、unchecked
D、unfortunate

答案B

解析 unrestrain是restrain的反义词，意思是“不受控制的”，与unexpect可替换。unavoidable不可避免的；unchecked不受检查的；unfortunate不走运的。故选B项。

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