Up till now, the moon is known as a (an) __________ place because nothing can live or grow there.
A:peaceful
B:empty
C:lifeless
如图,在平面直角坐标系中,Rt△ABC的三个顶点分别是A(﹣3,2),B(0,4),C(0,2).
已知a+b=4,c-d=-3,则(b+c)-(d-a)的值为 ( )