People ______ drive after drinking wine or beer according to the new laws.
A:couldn't
B:needn't
C:wouldn't
D:mustn't
下列各组(每组两个)三角形中,不相似的是( )
在△ABC中,P是BC边的中点,角A,B,C的对边分别是a,b,c,若cAC→+aPA→+bPB→=0→,则△ABC的形状为( )