They are going to see the movie Avatar (阿凡达). Why not ________ them?[ ]

A. to join

B. join

C. joining

减少左旋多巴不良反应并增加其疗效的药物是（　　）

A．苯妥英钠

B．苯巴比妥

C．乙琥胺

D．卡比多巴

E．维生素B₆