— Attention, please. The plane has to be _________ because of the foggy weather.

— Oh, bad luck! We have to wait now.

A．put on

B．put off

C．put up

D．put away

一、二级导线的边长，一般采用（）量距。

A、皮尺

B、测绳

C、钢尺

D、测距仪