题目内容
阅读理解
This is a street crossing. There are red and green lights at each corner. Drivers must watch the lights carefully. When there is 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 to green. Then they can go on. Sometimes the cars want to make a right turn or a left turn. They can make a right turn when the light is green or red. But they must wait until the green light is shining if they want to turn left.
Some people are colour-blind. They can not see the different between red and green. These people must not drive or there will be an accident. We must keep our streets safe.
1．Drivers must pay attention to ________ at each corner of the street crossing.
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2．No one should drive on when ________.
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3．A car can turn right when there is ________.
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A．either a green light or a red one
B．a green light but not a red one
C．not only a green light but also a red one
D．no green light or red one
4．A car can not make a left turn ________ the green light shines.
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5．Something may happen to a colour-blind man if he ________.
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