This is a street crossing.There are traffic lights at each corner(拐角).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 into green. Then they can go on.
Some people are colour-blind(色盲), and they can't see the differences between red and green. These people mustn't drive, or there will be an accident(事故). We must keep our streets safe.
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(1)
Drivers must pay attention to ____at the street crossing.
A . the red light
B . the green light
C . the traffic lights
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(2)
The cars go on when ____.
A . there is a green light
B . there is a red light
C . there is a light
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(3)
A car must stop when there is ____.
A . a green light
B . a red light
C . on green light or red light
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(4)
Colour﹣blind people can't see the differences between ____.
A . red and green
B . yellow and green
C . red and blue
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(5)
Colour﹣blind people ____drive,or there will be an accident.
A . can
B . must not
C . may
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