公共产品和服务需求的快速增长与提供这些产品和服务的缓慢发展是其中一个需要引起严重关注的问题。

A.problem
B.difficutly
C.trouble
D.matter

A.trade had fallen off
B.the coinage had been sharply debased
C.spending had outdistanced income
D.profits from miming had declined