A:12
B:-12
C:2
D:-2
下列有关非洲气候特点的叙述,错误的是 ( )
Cars are so expensive that only the very rich can______to buy them.
① aa+b < cc+d ;② cc+d < aa+b ;③ dc+d<ba+b ;④ ba+b < dc+d
其中不等式正确的是()