— The classroom is ______ clean ______ it was yesterday.— Sorry, I forgot to clean it.
A:as; as
B:so; as
C:not as; as
D:more; than
如图,在四边形ABCD中,AD=BC,P是对角线BD的中点,M是DC的中点,N是AB的中点.求证:∠PMN=∠PNM.
在商品和服务市场上,“顾客是上帝”成为许多经营者的理念。对此你认为正确的是( )