二、完形填空。
阅读短文，从 A、B、C、D 四个选项中选出一个可以填入相应空白处的最佳答案。
Plastic pollution is a growing problem worldwide. Surprisingly, we have 16 only 9% of all plastic things that we have ever made.
The rest remains in the environment for centuries. It goes into the ocean harming sea life, breaks into tiny 17, and can even enter human bodies through water or food.
Recently, scientists have developed a new method by using the water in the air to 18 plastics. Their experiment had three key steps. First, 19 PET plastic which is common in bottles with special metal powder (粉末) and activated carbon (活性炭). Second, heat the mixture (混合物) to make plastic 20 weak. Third, leave it in air to change into chemicals that can be reused. Within hours, plastic waste can be turned into valuable chemical materials.
Luckily, the method only works on polyester (聚酯) plastics. This means there is no need to 21 it out from all the trash—water bottles can be used directly. Researchers discovered the air's natural moisture (水蒸气) level is 22 for the reaction (反应). Adding extra (额外的) water stops the reaction.
The science team now plans to use this technology in factories. “Our new solution could reduce plastic pollution 23,” they explained. “It reduces plastics' 24 to nature and gives materials a new life instead of being thrown away. It's a leap (跳跃) towards a cleaner and 25 future. It also shows how creative chemistry was to solve world challenges in a way that joins hands with nature.”
()16. A. thrown B. used C. put D. recycled
()17. A. cloth B. trash C. pieces D. medals
()18. A. break down B. break into C. cut down D. cut into
()19. A. compare B. mix C. share D. connect
()20. A. connections B. directions C. organizations D. productions
()21. A. look B. find C. pick D. get
()22. A. good B. perfect C. bad D. important
()23. A. greatly B. suddenly C. carefully D. physically
()24. A. interest B. harm C. development D. experiment
()25. A. taller B. dirtier C. worse D. greener

16. D
17. C 句意为“塑料危害海洋生物，分解成小颗粒，甚至能通过食物和水进入人体”。break into pieces意为“分解成小颗粒”。
18. A
19. B 句意为“首先，把一种特殊的金属粉末、活性炭和在塑料瓶中常见的PET塑料混合”。mix意为“混合”。
20. A 21. C 22. B 23. A
24. B 句意为“它能够减少塑料对自然的危害并且给予旧材料新的生命”。harm意为“危害”。
25. D

【分析】
做完形填空需结合上下文语境、词义辨析及固定搭配选择答案。先通读全文理解主题（塑料污染与降解方法），再逐题分析：16题根据塑料污染背景，判断是“回收”的塑料占比；17题结合塑料分解的常识，对应固定搭配“break into pieces”；18题选表示“分解”的短语；19题用固定搭配“mix...with...”；20题加热使塑料的“连接”变弱；21题选“挑选”的短语；22题根据后文“额外水阻止反应”，判断自然湿度是“完美的”；23题选修饰减少污染的副词；24题对应“危害自然”；25题选与cleaner并列的“更绿色的”。
【解析】
16题：语境为塑料污染问题，仅9%的塑料被回收，recycled（回收）符合，选D。
17题：固定搭配break into pieces意为“分解成小碎片”，塑料分解后成小碎片，选C。
18题：break down意为“分解”，科学家用空气中的水分解塑料，符合语境，选A。
19题：mix...with...是固定搭配，意为“把……和……混合”，此处将PET塑料与粉末、活性炭混合，选B。
20题：connections意为“连接”，加热使塑料的连接变弱便于分解，选A。
21题：pick out意为“挑选出”，此处指无需从垃圾中挑选聚酯塑料，选C。
22题：后文提到额外水阻止反应，说明空气自然湿度对反应是完美的，选B。
23题：greatly意为“大大地”，新方法能大大减少塑料污染，选A。
24题：harm意为“危害”，减少塑料对自然的危害，选B。
25题：greener意为“更绿色的”，与cleaner并列，指更清洁绿色的未来，选D。
【答案】
16.D 17.C 18.A 19.B 20.A 21.C 22.B 23.A 24.B 25.D
【知识点】
英语完形填空、词汇辨析、固定搭配
【点评】
本题围绕塑料污染及新型降解技术展开，考查学生对上下文语境的理解、常用词汇及固定搭配的掌握，主题贴近环保热点，难度适中。
【难度系数】
0.6