题目内容
Many people have to do their own things every day. Some of them ride bikes and some of them drive cars, so streets look very busy.
This is a street crossing. There are red and green 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 light changes to green. Then they can go. 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.
But some people are color-blind（色盲）. They can't tell the difference between red and green. These people must not drive. We must keep our streets safe.
(1) The streets look busy because ________.
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A．there are so many people and cars or bikes
B．the streets are not wide enough
C．many people like traveling
D．the streets are fewer than before
(2) Drivers must see ________ clearly at a corner of the street crossing.
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A．the people and bikes
B．the old and young people
C．the green light and the red light
D．the students who are going to school
(3) Cars can't go ________.
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(4) A car can turn right when ________.
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A．there is a green or red light
B．there is only a green light
C．there is only a red light
D．there is no way
(5) If someone is a color-blind, he ________.
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