2018高考英语二轮复习阅读理解话题学案(十)科普知识类ppt课件

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  • 课件名称: 2018高考英语二轮复习阅读理解话题学案(十)科普知识类ppt课件
  • 课件科目: 高三英语课件
  • 制作软件: PPT/FLASH/其他
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  • 更新时间: 2018年04月25日
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A build­it­yourself solar still (蒸馏器) is one of the best ways to obtain drinking water in areas where the liquid is not readily available. Developed by two doctors in the  U.S. Department of Agriculture, it's an excellent water collector.Unfortunately, you must carry the necessary equipment with you, since it's all but impossible to find natural substitutes.The only components required, though, are a 5′×5′ sheet of clear or slightly milky plastic, six feet of plastic tube, and a container — perhaps just a drinking cup — to catch the water. These pieces can be folded into a neat little pack and fastened on your belt.