The cornerstones of the post-war economic boom （1945一1960s） in the U.S. were the industries of automobile，housing and______.
A.defense B.mining C.food processing D.service正确答案A
The cornerstones of the post-war economic boom （1945一1960s） in the U.S. were the industries of automobile，housing and______.
A.defense B.mining C.food processing D.service正确答案A
