—How do you like your English teacher?

—____________.

A．Yes,I like him very much

B．No,I don’t like him

C．I like him

D．He is very kind

静止在水平桌面上的书受到______力和______力，这两个力的施力物体分别是______和______，这两个力是______力．物体在平衡力作用下所受合力为______．