-8的相反数是______.
-8的相反数是8.
— ____ is this sweater?
— It's Sarah's. [ ]
A. Where
B. Whose
C. What
下图所示农具是唐朝时发明的,它属于
A.纺织工具
B.灌溉工具
C.交通工具
D.耕作工具