Period 5: Cultural Corner学习目标：1. 了解人们对未来世界的种种预测2. 树立跨文化交际意识3. 掌握重点句子的用法学习重点：了解人们对未来世界的种种预测学习难点：掌握重点句子的用法课前预习使用说明与学法指导：1. 树立跨文化交际意识2. 15 分钟之内完成教材助读： Glass RecyclingGlass has the least volatile pricing of all the post consumer recycling commodities. Composed of sand and potash; bottle glass is made from readily available and inexpensive raw materials. To be competitive, recycled glass must maintain a price that competes with these abundant raw materials. Traded as flint (clear), amber (brown), emerald (green) or mixed color broken glass. The price depends on the cleanliness and color of the recycled product. Clean flint cullet (another w ord for broken glass) is usually the most desirable form of recycled glass scrap. Mixed color broken glass with ceramics or stones mixed in it is the least desirable grade of cullet bringing the lowest price. Most Recyclers color sort and break or crush and screen bottles before selling their product. Modern, high production bottle manufacturing requires very clean and uniform feedstock. Over the past decade there has been a growth in the glass benefacti on sector. These are intermediate processors that receive glass from recycling programs and run it through a series of steps to remove any contaminants (rocks, ceramics, metal caps, etc.) and provide a uniform feedstock to the bottle manufacturers. These preprocessor provide an excellent market for recycling programs that do not have the volume or ability to produce glass for direct mill delivery. Glass beneficiation plants use sophisticated optical sorting machines to separate the glass into the three color types. They may also x-ray the ...
