A:140°E,40°N
B:150°W,20°N
C:165°E,45°N
D:170°W,70°N
设实数x,y满足约束条件{x≥0x+2y≥32x+y≤3,则z=x-y的最小值为 ( )
____
—Would you mind staying in such a noisy room?
—No, but my son needs a _________ place to study in.