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 used for
traffic 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 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. 1. When the traffic lights turn ______, we will stop driving a car.A. red
B. 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 Chinese. 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 see 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 use red traffic lights
题型：未知 难度：其他题型
答案
1-5 ABCCC
点击查看科教类阅读知识点讲解,巩固学习
解析
该题暂无解析
考点
据考高分专家说，试题“阅读理解。 When.....”主要考查你对 [科教类阅读 ]考点的理解。
科教类阅读
科普类的阅读：
科普类的阅读理解包含介绍科学知识、社会知识的短文。阅读这类短文时，要以事实为中心进行思考，抓住事物的特征、用途、相互关系等。
如果是介绍社会现象的文章，要掌握所谈现象的内涵。
答题技巧：
1. 加强整体意识，把握文章的主要内容。在阅读的时候可给段落标上序号，并给重要的句子和
关键词做上记号，尤其是各段中心句，为答题提供更快捷更多的信息源。
2. 审清题干，发觉和把握试题中有效的提示性信息，确认命题的角度、阅读范围和答题方式。
3. 定位阅读，强化对应意识。同时要注意原文利用和自我加工相结合。
