Rather than ______ on a crowded bus, he always prefers _____ a bicycle.

A．ride, ride

B．riding, ride

C．ride, to ride

D．to ride, riding

下列哪项属于中频电疗设备：（）。

A.直流感应电疗仪

B.超短波治疗仪

C.神经肌肉电刺激治疗仪

D.立体动态干扰电疗仪

E、经皮神经电刺激治疗仪