阅读理解。 When the traffic lights turn red, we will stop driving a car or

题文

阅读理解。     When the traffic lights turn red, we will stop driving a car or crossing a street. Why is red ud fortraffic lights instead of other colors?      As we know, scattering (散射) happens when light goes through the air. For the same media (媒质),if the wavelength is long, the scattering will be short. If the wavelength is short, then the scattering willbe long.      Of all lights we can e red has the longest wavelength, so the scattering is the weakest. That meansthe red light travels far. In fact, it travels farther on rainy days.      Using the red light can help drivers in farther areas c the lights. It helps drivers stow down or stopin lime. If drivers don't e the red light until they are clo, 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 e the color red. In a word, red lights help drivers stop in time and help prevent accidents. 1. When the traffic lights turn ______, we will stop driving a car.A. redB. green C. yellow 2. According to the passage, the scattering of the red light is the _______. A. longest B. weakest C. farthest 3. The underlined word "wavelength" means________ in Chine. A. 波浪 B. 光波C. 波长 4. What can the red light help drivers do? A. It can help drivers in farther areas e the lights. B. It can help drivers slow down or stop in time. C. A and B 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 u red traffic lights

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1-5      ABCCC

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