— Is the gray shirt Mr. Zhou's?
— I it is his. His is white.
A:think
B:do think
C:am think
D:don't think
黄土高原特有的传统民居是( )
草酸(C2H2O4)是存在于植物体内的一种物质,过量食用会造成人体内酸碱失衡.草酸属于( )