题目

Bob and Frank are good friends. They often go to movies together(一起) on weekends. Bob's favorite actor is Cheng Long. He has an action movie, Who Am I. It's very exciting. Frank likes the actor Rick Smith. He really likes his movie. Black September. Frank thinks it's a very successful thriller. Bob and Frank are American(美国人), but they both like Beijing Opera, they think they can learn about Chinese history from these movies. （1） Bob and Frank often_________ together on weekends. A . go to school(上学) B . go to a movie C . are good friends D . go to see an action mo如图所示，在水平地面上，一条形磁铁附近的一铁块处于静止状态．下列说法正确的是（ ）A．铁块受到的重力和铁块对地面的压力是一对平衡力B．地面对铁块的支持力和铁块受到的重力是一对平衡力C．磁铁受到铁块的吸引力跟地面对铁块的摩擦力是一对平衡力D．铁块受到磁铁的吸引力跟磁铁受到铁块的吸引力是一对平衡力