2. 职称英语
  3. [audioFiles]2017m5s/audio_ezfj_178_201705[/audioFiles] Tracking Toxic Chemic

[audioFiles]2017m5s/audio_ezfj_178_201705[/audioFiles] Tracking Toxic Chemic

游客2023-10-30  7
问题  
选项
答案     Tracking Toxic Chemicals
    The fireproof chemicals used in furniture and clothing / can become toxic pollutants when winding up in the environment. / As they are in the environment all over the world, / tracking the spread of them has been a major challenge. / But it got easier since a new technique has been developed / to measure the presence and concentration of these chemicals in the air by sampling tree bark. / A tree’s bark provides a large surface area that takes in chemicals. / Also, because a layer of bark remains on the tree for years before being shed, / it provides a unique record of the environment over time. /
解析
转载请注明原文地址:https://tihaiku.com/zcyy/3143030.html
相关试题推荐
随机试题
最新回复(0)