—_________. It's OK.
A:I don't mind it
B:I love it
C:I don't know it
D:I can't stand it
设变量x、y满足约束条件:{y≥xx+2y≤2x≥-2,则z=x-3y+2的最小值为( )
“雨露滋润禾苗壮”,这种现象说明( )