I think the increasing population is one of the greatest c--

问题描述：

I think the increasing population is one of the greatest c____ today.

1个回答分类：英语 2014-11-29

问题解答：

我来补答

I think the increasing population is one of the greatest crises(危机) today.
one of + 复数名词,而crises 是crisis的复数形式.

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