She was so________in her job that she didn’t hear someone knocking at the door.

A．absorbed

B．attracted

C．drawn

D．concentrated

在旅客列车（）时，运转车长可在客车车梯上显示发车信号。

A、站台旅客太多

B、尾部未进入站台

C、天气不良

D、夜间照明不足