雅思阅读真题（Part 3）
Part 3 · 考频：中频 · 最近考试：2026.7.18/2022.3.3
In the early 1990s, scientists at the US-based agricultural firm Cargtill achieved a technological breakthrough when they succeeded in converting corn, a natural, renewable resource, into a polymer (or plastic) suitable for a broad variety of applications.
A
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答案：produce plastic from plant
原文定位：In the early 1990s, scientists at the US-based agricultural firm Cargtill achieved a technological breakthrough when they succeeded in converting corn, a natural, renewable resource, into a polymer (or plastic) suitable for a broad variety of applications
同义替换：「manage to」↔「succeed in」，「produce」↔「converting」
答案：selling plastic in market
原文定位：The company needed a partner with access to plastics markets and polymerization capabilities, and began discussions with The Dow Chemical Company
同义替换：「needs to have contacts with」↔「needed a partner with access to」
答案：wrapping products
原文定位：Cargill Dow’s product is the world’s first commercially available plastic made from annually renewable resources such as corn: Nature Works™ PLA is a family of packaging polymers (carbon-based molecules) made from non-petroleum based resources
答案：make things like clothes
原文定位：Ingeo is a family of polymers for fibers made in a similar manner
答案：starch
原文定位：The process for making Nature Works PLA begins when a renewable resource such as corn is milled, separating starch from the raw material
答案：fermentation process
原文定位：Cargill Dow turns the unrefined dextrose into lactic acid using a fermentation process similar to that used by beer and wine producers
答案：condensation process
原文定位：Through a special condensation process, a lactide is formed
答案：polymer
原文定位：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
答案：It can save food freshness
原文定位：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
答案：packaging fresh food
原文定位：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
答案：It takes in moisture of skin,Comfortable sportswear
原文定位：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;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
答案：It is made of renewable raw materials,It uses renewable raw resources
原文定位：The source material for PLA is a natural sugar found in plants such as corn 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 petroleum-based 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
同义替换：「renewable」↔「regenerated」