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

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Ithinktheincreasingpopulationisoneofthegreatestc____today.Ithinktheincreasingpopulationisoneofthegre

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

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

crises