对矿用橡胶套电缆的描述（）。
A、适用于移动电器设备供电
B、柔软性好
C、便于移动
D、以上都是
参考答案：D
As the boy listened attentively in class, everything his teacher said was easily______.
A．for him to understand
B．understood
C．to understand
D．to be understood
词尾
