阅读理解Ifwearedrivingacarorcrossing

阅读理解 If we are driving a car or crossing a street, we will stop when the traffic lights turn red. Why do we use red rather than other colors?
As we know, scattering (散射) happens when light goes through the air. For the same media, if the wavelength (波长) is long, the scattering will be short. If the wavelength is short, then the scattering will be long.
Of all light 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 see the lights. It helps drivers slow down or stop in time. 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 light helps drivers stop in time and help prevent accidents1.______ has the longest wavelength of all light we can seeA.RedB.GreenC.YellowD.Black2.Red light travels farther on ______ daysA.windyB.sunnyC.rainyD.cloudy3.Red can make people act more quickly because ______.A.red can make people happierB.the scattering of red is very shortC.the scattering of red is very longD.red can make people more excited4.The underlined word “prevent” means ______ in ChineseA.逃避B.防止C.处理D.检查5.The passage mainly tells us ______.A.why accidents happenB.how the red light travelsC.why we use red traffic lightsD.how to stop in time at traffic lights

ACDBC解析1.根据we can see red has the longest wavelength,描述可知选A。
2.根据In fact, it travels farther on rainy days. 可知选C。
3.根据Red can also excite people. We can act more quickly when we see the color red. 可知选D。
4.根据上文stop in time 及时停止，可知下文句意为预防阻止事故，故选B。
5.通过短文描述可知本文主要是介绍了人们为什么使用红色作为交通信号灯，故选C。

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