题文
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 accidents.
小题1:______ has the longest wavelength of all light we can see.A．RedB．GreenC．YellowD．Black小题2:Red light travels farther on ______ days.A．windyB．sunnyC．rainyD．cloudy小题3: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 excited小题4:The underlined word “prevent” means ______ in Chinese.A．逃避B．防止C．处理D．检查小题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
题型：未知 难度：其他题型
答案
小题1:A
小题1:C
小题1:D
小题1:B
小题1:C
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解析
小题1:根据we can see red has the longest wavelength,描述可知选A。
小题1:根据In fact, it travels farther on rainy days. 可知选C。
小题1:根据Red can also excite people. We can act more quickly when we see the color red. 可知选D。
小题1: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。
小题1: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。
考点
据考高分专家说，试题“If we are driving a .....”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。
