物体从高为H处自由落下，当它的动能和势能相等时，物体离地面的高度h和它的瞬时速度的大小v为：

A．h =H，v =

B．h =H，v =

C．h =H，v =

D．h =H，v =

— What do you think of the human and the computer?

—A human ____can do some things better than a computer, for example, creating new ideas.

A．head

B．body

C．brain

D．arm