高速公路的最大纵坡限为（）.

A.5%～7%

B.3%～5%

C.1%～3%

D.1%以下

I don't think it's good to copy other's homework. You should         it.

                                                                                                                                                        [ ]

A. get up              

B. get on

C. get over              

D. get off