读美国示意图,图中阴影地区人口稠密,城市集中,适宜发展( )
A:小麦种植业
B:玉米种植业
C:棉花种植业
D:乳肉畜牧业
——Did the book give the ___________ you needed?——Yes. But ____________ it, I had to read the whole book.