— Nancy, how long does it take to fly to Canada?

— Sorry, I don't know. But I can telephone my father to _____ it for you. [ ]

A. do

B. check

C. catch

D. find

在如图所示的实验装置中，用导线将铝棒悬挂于磁铁N、S之间，将导线连接到电源两极上，观察到铝棒发生摆动．利用这一现象可制成的设备是

A．电饭煲

B．电视机

C．发电机

D．电动机