A:朴素唯物主义
B:辩证唯物主义
C:客观唯心主义
D:主观唯心主义
25÷7=()()7 11÷15=11()
如图,在平面直角坐标系中,A(1,2),B(3,1),C(﹣2,﹣1).
6+2=____
—Excuse me. Where is school library? —This way, please.