Mary is as fast as, if not faster than, anyone in her class and should be on the team.

A．as fast, if not faster than, anyone else

B．as fast as, if not more fast than, anyone

C．as fast as, if not faster than, anyone else

D．as fast, if not faster than, anyone

玩具小船上固定有螺线管（有铁芯）、电源和开关组成的电路，如图所示，把小船按图示的方向放在水面上，闭合开关，船头最后静止时的指向是：

A.向东  

B.向南    

C.向西   

 D.向北