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大单元学三步一体高效训练讲评conditions (bacteria, water, etc).札记This latest project is the first ever to analyze the impact of both petroleum-based plastics andbiodegradable plastics on wild fish.Lead study author Ashleigh Hawke explains that petroleumbased plastic exposure usually negatively affects fishes’ escape performance, routine swimming andaerobic metabolism. On the other hand, fish exposed to bioplastics saw their maximum escape speedslow considerably. So,while petroleum-based plastics are worse for fish,biodegradable productsstill aren't doing aquatic (水中的） life any favors.“Biodegradable plastics may not be the silver bulletstill cause negative effects to those animals that may be exposed to themin the case of this study，populations would decline as their escape behaviors are weakened.”"The development of traditional plastics has been well established for decades and so there islittle variation in the production of them.However, because biodegradable plastics are a relativelynew area, there is variation in the way they are manufactured and the materials that are being used,”concludes study co-author Dr Bridie Allan,who adds more must be done at a policy level to protectmarine environments. “This research shows that the use of raw materials should be more regulatedand controlled. "11. What can we know about the previous studies in paragraph 2?A. They found ways to help microplastics break down.B. They ignored the influence of biodegradable plastics on marine life.C. They provided ways to make use of biodegradable plastics.D. They presented the disadvantages of biodegradable plastics.12. In what aspect do biodegradable plastics and petroleum-based ones have similar impacts?B. Fishes' usual swimming.A. Fishes' escape action.C. Fishes' hunting food areas.D. Fishes’ aerobic metabolism.13. Which of the following best explains the underlined phrase "the silver bullet" in paragraph 3?A. The ideal solution.B. The easy entrance.C. The careful mention.D. The wide exposure.14. What should humans do according to the research finding?A. Train fishes' escape speed.B. Give up biodegradable plastics.C. Replace petroleum-based plastics.D. Regulate the use of raw materials.【答案与解析】11.B第2段第1句指出，人们对可生物降解塑料对海底的影响知之甚少。由此可知，以前的研究忽视了可生物降解塑料给海洋生物带来的影响。12.A根据第3段第2、3句可知，可生物降解塑料和石油基塑料都会使鱼类的逃跑速度减慢。13.A第3段末句表明，尽管可生物降解塑料没那么糟，但还是会给接触到的动物带来消极影响。由此可知，可生物降解塑料也不是理想的解决办法。a silverbullet意为“妙招；良方”。14.D根据文章最后两句可知，这项研究表明，可生物降解塑料使用的原材料很重要，应该对其使用进行更多的监管和控制。25ZC·英语-WYB-选择性必修第三册-Y