crifices for the country were neverofficially , which made all of usfeel discouraged.

To discuss “population as a global __________ ”, we are supposed to know about the history of populationtrends.

, which has been widely used in________ recent years, is ________ good way of ________ communication

The charity walkers arrived at the small town a rainy morning.

下列各句中划线的成语使用恰当的一句是（）