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As we know, scattering(散射) happens when light goes through the air. For the same media(媒质), if the wavelength islong, the scattering will be short. If the wavelength is short, then the scattering will be long.
Of all lights we can see red has the longest wavelength, so the scattering is the weakest. That means the red light travels far. In fact, it travels farther on rainy days.
Using the red light can help drivers in farther areas sec the lights. It helps drivers stow down or stop in lime. If drivers don't see the red light until they are close, they may not be able to stop the car in time. An accident may happen Red can also excite people. We can act more quickly when we see the color red. In a word, red lights help drivers stop in time and help prevent accidents.
【小题1】 When the traffic lights turn ______, we will stop driving a car.
A. red B green C. yellow
【小题2】According to the passage, the scattering of the red light is the _______.
A. longest b. weakest C. farthest
【小题3】 The underlined word "wavelength" means________ in Chinese.
A.波浪 B.光波 C.波长
【小题4】 What can the red light help drivers do?
A. It can help drivers in farther areas see the lights.
b. It can help drivers slow down or stop in time.
C.A and b
【小题5】Which of the following is the best title?
A. Why do accidents happen
b. How does the red light travel
C. Why do we use red traffic lights 查看习题详情和答案>>
(A)There was ice on the road, and the doctor’s car hit a tree and turned over three times.To his surrise,he wasn’t hurt.He got out of the car and walked to the nearest house.he wanted to telephone the garage for help.AA woman,one of his patients,opened the door.”Oh,doctor,”she said,”I have only just telephoned you.You must have a very fast car.You hae got here very quickly,there was a very bad accident on the road outside.I saw it through the window.I’m sure the driver will need your help.”
判断正误（写T或F）
( )1.The doctor was driving t the garage before the accident.
( )2.A tree fell across te road,so the traffic accident happened.
( )3.The doctor knew one of his patients lived in the nearest house.
( )4. The patient phoned the doctor because she thought someone needed help.
( )5. The woman wanted the doctor,but was surprised that he came so quickly.
(B) This is a street crossing. There are red and green lights at each corner. Drivers must watch he lights carefully.When there is a green light, the cars may go. When there is a red light, the cars must stop. Drivers must wait until the red light changes to green. Then they can go. Sometimes drivers 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’t see the difference between red and green. These people must not drive, or else there will be accidents. We must keep our streets safe.
( )6.Drivers must watch __carefully at each corner.
A. Green lights B. red lights C. the policeman D. both A and B( )7.When there is a red light, ___________.
A. the cars must stop B. the cars may go
C. the cars may make a left turn D. the cars can’t stop
( )8. The cars can make a left turn when _______________.
A. There is a red light B. There is a green light
C. There is a red or green light D. There is a yellow light
( )9.The colour-blind people must not drive because____________.
they are blind B. they can’t tell the difference between red and green.
A. C.they can’t hear anything D. they can’t see the lights.
( )10.According to the passage, we can know ____________.
A. where there is a street crossing, there are traffic lights
B. the colour-blind people caused(引起) all the traffic accidents
C.if drivers always watch the traffic lights carefully, there will be fewer accidents
D. people who wear glasses cannot drive cars.
查看习题详情和答案>>完形填空
Paris has a beautiful name, the City of 1 . Do you know 2 it means? Many beautiful buildings are lighted at 3 . The streets are very 4 . When you 5 in Paris, you must not turn 6 your headlights(汽车前灯) even after dark.
Paris is full of life all day and all night. But this is not the 7 reason (原因) for its beautiful name. For hundreds of years, Paris has been the center of science and art. 8 scientists and artists have come to 9 here. For this reason also, people 10 it the city of lights.
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完形填空
Paris has a beautiful name, the City of 1 Do you know 2 it means? Many beautiful buildings are lighted at 3 .The street are very 4 .When you 5 in Paris, you need not turn 6 your headlights even after dark.
Paris is full of light all day and all night. But this is not the 7 reason for its beautiful name. For hundreds of years, Paris has been the centre of science and art. 8 scientists and artists have come to 9 here. For this reason also, people 10 it the City of Lights.
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