夜间显示股道号数码信号时，三道显示为（）。
A、白色灯光上下摇动
B、白色灯光左右摇动
C、白色灯光高举
D、黄色灯光高举
参考答案：A
Amy usually _______ from school, but today she goes home by bike.
A．walk home
B．walk to home
C．walks home
D．walks to home
