南京朗阁10月14日雅思考试阅读回顾

　　南京朗阁10月14日雅思考试阅读回顾

　　P1 野马保护 Back to wild

　　P2 视觉艺术发展 Can we call it “ART”

　　P3 合成塑料的应用Nature works for Nature Works™ PLA

　　南京朗阁名师边晓菲点评

　　1. 本次考试难度中等。

　　2. 整体分析：涉及自然科学，艺术发展和科技类话题

　　3. 主要题型：延续今年考试的重点，主流题型依然为配对，填空和判断。 在本场考试中出现多选题型，大家多加关注。

　　4. P1 Back to wild 野马保护

　　判断4 + summary 5 + 简答4

　　答案待补充

　　文章大意：科学家为了保护野马，开展多个拯救计划。

　　P2 Can we call it “ART” 视觉艺术发展

　　段落信息配对5 + 判断 6 + 多选2

                             

　　参考答案：

　　14. C

　　15. E

　　16. B

　　17. F

　　18. D

　　19. NO

　　20. NO

　　21. NO

　　22. NOT GIVEN

　　23. NO

　　24. YES

　　25. B

　　26. D

　　P3 Nature works for Nature Works™ PLA合成塑料的应用

　　配对4+ 流程图填空4+单选+多选

　　参考答案

　　27. B

　　28. C

　　29. F

　　30. A

　　31. starch

　　32. fermentation

　　33. condensation

　　34. ploymer

　　35. B

　　36. C

　　37. A

　　38. D

　　39. A

　　40. C

　　参考文章：

　　A

　　A dozen years ago, scientists at Cargill got the idea of converting lactic acid made from corn into plastic while examining possible new uses for materials produced from corn wet milling processes. In the past, several efforts had been made to develop plastics from lactic acid, but with limited success. Achieving this technological breakthrough didn’t come easily, but in time the efforts did succeed. A fermentation and distillation process using com was designed to create a polymer suitable for a broad variety of applications.

　　B

　　As an agricultural based firm, Cargill had taken this product as far as it could by 1997. The company needed a partner with access to plastics markets and polymerization capabilities, and began discussions with The Dow Chemical Company. The next step was the formation of the joint venture that created Cargill Dow LLC. Cargill Dow’s product is the world’s first commercially available plastic made from annually renewable resources such as com:Nature Works™ PLA is a family of packaging polymers (carbon-based molecules) made from non-petroleum based resources.Ingeo is a family of polymers for fibers made in a similar manner.

　　C

　　By applying their unique technology to the processing of natural plant sugars, Cargill Dow has created a more environmentally friendly material that reaches the consumer in clothes, cups, packaging and other products. While Cargill Dow is a stand-alone business, it continues to leverage the agricultural processing, manufacturing and polymer expertise of the two parent companies in order to bring the best possible products to market.

　　D

　　The basic raw materials for PLA are carbon dioxide and water. Growing plants, like com take these building blocks from the atmosphere and the soil. They are combined in the plant to make carbohydrates (sucrose and starch) through a process driven by photosynthesis. The process for making Nature Works PLA begins when a renewable resource such as corn is milled, separating starch from the raw material. Unrefined dextrose, in turn, is processed from the starch.

　　E

　　Cargill Dow turns the unrefined dextrose into lactic acid using a fermentation process similar to that used by beer and wine producers. This is the same lactic acid that is used as a food additive and is found in muscle tissue in the human body. Through a special condensation process, a lactide is formed. This lactide is purified through vacuum distillation and becomes a polymer (the base for NatureWorks PLA) that is ready for use through a solvent-free melt process. Development of this new technology allows the company to “harvest” the carbon that living plants remove from the air through photosynthesis. Carbon is stored in plant starches, which can be broken down into natural plant sugars. The carbon and other elements in these natural sugars are then used to make NatureWorks PLA.

　　F

　　Nature Works PLA fits all disposal systems and is fully compostable in commercial composting facilities. With the proper infrastructure, products made from this polymer can be recycled back to a monomer and re-used as a polymer. Thus, at the end of its life cycle, a product made from Nature Works PLA can be broken down into its simplest parts so that no sign of it remains.

　　G

　　PLA is now actively competing with traditional materials in packaging and fiber applications throughout the world; based on the technology’s success and promise, Cargill Dow is quickly becoming a premier player in the polymers market. This new polymer now competes head-on with petroleum-based materials like polyester. A wide range of products that vary in molecular weight and crystallinity can be produced, and the blend of physical properties of PLA makes it suited for a broad range of fiber and packaging applications. Fiber and non-woven applications include clothing, fiberfill, blankets and wipes. Packaging applications include packaging films and food and beverage containers.

　　H

　　As Nature Works PLA polymers are more oil- and grease-resistant and provide a better flavor and aroma barrier than existing petroleum-based polymers, grocery retailers are increasingly using this packaging for their fresh foods. As companies begin to explore this family of polymers, more potential applications are being identified. For example, PLA possess two properties that are particularly useful for drape fabrics and window furnishings. Their resistance to ultraviolet light is particularly appealing as this reduces the amount of fading in such fabrics, and their refractive index is low, which means fabrics constructed from these polymers can be made with deep colors without requiring large amounts of dye. In addition, sportswear makers have been drawn to the product as it has an inherent ability to take moisture away from the skin and when blended with cotton and wool, the result is garments that are lighter and better at absorbing moisture.

　　I

　　PLA combines inexpensive large-scale fermentation with chemical processing to produce a value-added polymer product that improves the environment as well. The source material for PLA is a natural sugar found in plants such as com and using such renewable feedstock presents several environmental benefits. As an alternative to traditional petroleum-based polymers, the production of PLA uses 20%-50% less fossil fuel and releases a lower amount of greenhouse gasses than comparable petroleumbased plastic; carbon dioxide in the atmosphere is removed when the feedstock is grown and is returned to the earth when the polymer is degraded. Because the company is using raw materials that can be regenerated year after year, it is both cost competitive and environmentally responsible.

　　南京朗阁名师边晓菲考试预测

　　1. 下场考试的话题可能有关科技类、教育类、历史类。

　　2. 重点浏览15-16年机经。

　　现在报名南京朗阁雅思新托福课程优惠多多，优惠1：团报低至85折，优惠2：10.21雅思官方系列讲座-BC说雅思 现场报名85折，优惠3：网络预约立减200元!报名电话：13584079112

文中图片素材来源网络，如有侵权请联系删除