2019中考英语一轮练（1）（阅读理解+完形填空+任务型阅读达）
(限时:20分钟)
一、阅读理解
A
话题 体裁 词数 难度 建议用时
交通安全 说明文 176 ★★★ 5分钟
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(媒介), if the wavelength is long, the scattering will be short. If the wavelength is short, 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 travels far. In fact, it travels faster on rainy days.
Using the red light can
文档为rar格式
版权声明：以上文章中所选用的图片及文字来源于网络以及用户投稿，由于未联系到知识产权人或未发现有关知识产权的登记，如有知识产权人并不愿意我们使用，如果有侵权请立即联系：1234567890@qq.com，我们立即下架或删除。
附近文章：
快读网 www.kuaidu.com.cn 网站邮箱：wodd7@hotmail.com