根据所学常识判断下列说法是(√)否(×)正确。

( ) 1. There are always three lights: red, yellow and green.

( ) 2. It's not fast to go by plane.

( ) 3. If you go on foot, you don't need (需要) to know the traffic rules.

( ) 4. In the U. S., drivers drive on the right side of the road.

( ) 5. If the light is yellow, you can go.

开始冲压操作前，应事先确认已经做好（）。

A、认真检查防护装置的完好性

B、认真检查离合器的安全性

C、认真检查制动装置的安全性

D、清理干净工作台上一切不必要的物件