— What is your mother?
— .
A:She is at home
B:She is a nurse
C:She is sleeping
D:She is young
输入原料和半制成品
购买粮食、饲料及农业生产资料
输入机械设备、车辆等重工业产品
购买
燃料
其他
26%
24%
15%
12%
23%