This is a street crossing. There are traffic lights at each corner. Drivers must watch the lights carefully. When there is a green light, the cars may go on. When there is a red light, the cars must stop. They must wait until the red light changes (变成) into green. Then they can go on.
Some people are colour-blind (色盲), and they can't see the difference between red and green. These people mustn't drive or there will be an accident (交通事故). We must keep our streets safe.
-
(1)
Drivers must pay attention to ____ at each corner of the street crossing.
A . the traffic lights
B . the green light
C . the red light
-
-
(2)
No one should drive on when ____.
A . the light changes
B . the red light shows
C . the green light shows
-
-
(3)
A car can turn right when there is ____.
A . a green light
B . a red one
C . both A and B
-
-
(4)
A car can make a left turn when the ____ light shines.
A . green
B . red
C . both A and B
-
-
(5)
Colour-blind people ____ drive, or there will be an accident.
A . can
B . mustn't
C . may
-