_________ was NOT a cornerstone of the postwar American economic boom.
A、Increasing investment in agriculture
B、An ever-increasing military spending
C、Automobile manufacturing for the growing new communities
D、construction boom to provide houses and schools for all children
【正确答案】：A
【题目解析】：战后美国经济繁荣的基石是：汽车、住房和国防工业。
