关于下列四个情景的说法错误的是( ) A . 发声的音叉将乒乓球弹开,说明发声的物体在振动 B . 不能听到真空罩中闹钟的闹铃声,说明声波的传播需要介质 C . 城区内某些路段禁止汽车鸣笛,是为了从声音的传播环节控制噪声 D . 发声扬声器的烛焰晃动,说明声波能传递能量 答案:CHe carefully but he could not his teacher clearly.
[ ]A. heard; listen B. listen; hear C. listened; hear D. heard; listened