— ________ invention the wheel is!— I can't agree more. It is an invention that changed the world.
A:What a useful
B:How useful
C:What a useless
D:How useless
划分东、西半球的经线是( )
下列关于两次世界大战相似点的表述中不正确的是( )
南北回归线之间的区域一年经历几次太阳直射( )