阅读理解Thisisastreetcrossing.Therearere

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 a green light, the cars may go. 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 color-blind(色盲). They can not tell the difference(不同) between the red and green lights. These people must not drive, or there will be accidents. We must keep our streets safe.1.Drivers must watch _____ carefully at each corner.A.green lights        B.red lights           C.both green lights and red lights2.When there is a red light _____ .A.the cars must stop               B.the cars may go on     C.the cars may make a left turn3.Cars can make a right turn when _____ .A.there is a red light             B.there is a green light    C.there is a red or green light4.Color-blind people may have accidents because _____ .A.they can’t see carsB.they can’t see the lightsC.they can’t tell the difference between the red and green lights5.According to (根据) the passage _____ must not drive.A.young people    B.color-blind people             C.old men