一个圆锥体的体积是8立方米，底面积是4平方米，高是（ ）米。
6
如果a与2互为相反数，则|a|等于（ ）
A．2
B．-2
C．1
D．-1
Most of us know we should cut down on fat,but knowing such things isn’t much help when
it shopping and eating. [ ]
A.refers to
B.speaks of
C.focuses on
D.comes to
