Though the impressionists’ paintings were not popular when they first appeared, they are now accepted as the beginning of ______ we call “modern art”.

A．that

B．what

C．which

D．why

社会主义初级阶段主要矛盾的主要方面是

A．人民日益增长的物质文化需要
B．改革滞后
C．贫富差距过大
D．落后的社会生产