2. 职称英语
  3. [audioFiles]2014m8s/audio_ezfj_014_20144[/audioFiles] Th

[audioFiles]2014m8s/audio_ezfj_014_20144[/audioFiles] Th

游客2023-11-07  42
问题  
选项
答案                         The Color of Snow
    Generally, the color of snow appears white. / This is because the light we see from the sun is white. / Most natural materials take in some sunlight. / This gives them their color. / However, when light travels from air to snow, some light is sent back, or reflected. / Snow crystals have many surfaces to reflect sunlight. / Yet the snow does take in a little sunlight. / It is this light that gives snow its white appearance. /
    Sometimes, snow may appear to be blue. / The blue light is the product of a long travel path through the snow. / In simple terms, think of snow as a filter. / A filter is designed to reject some substances, / while permitting others to pass through. / In the case of snow, all the light makes it through if the snow is only a centimeter thick. / If it is a meter or more thick, however, blue light often can be seen. /
解析
转载请注明原文地址:http://tihaiku.com/zcyy/3166992.html
相关试题推荐
随机试题
最新回复(0)