(2025·四川泸州)Plastic waste is an increasingly important problem. Up to now, only 9% of the plastics ever produced have been recycled. The rest remain on earth for hundreds of years. They wash out to the ocean to become rubbish, harm wildlife and break down into small plastics that can enter the human brain and other parts of our bodies.
Recently, scientists have developed a new method to break down plastic waste with the help of water in the air. The researchers mixed a special metal and activated carbon(活性炭) with PET, the most common type of polyester(聚酯纤维) plastic. Then they heated the mixture. After a short time, this broke the chemical connections in the polyester. Next, when the team left the material in the air, the mixture turned into TPA, a polyester material, and acetaldehyde (乙醇), an industrial chemical. Finally, these valuable chemical materials were recycled.
After the first success, researchers tested the method on different plastics and found it worked on polyester plastic only. That meant they didn't need to separate different kinds of plastics. Also, when they added water, it stopped working because the amount of water in the air was just right.
The team's next plan will be to use the method widely in industry.
"It's hopeful that our technology can hugely reduce plastic pollution, lower the environmental footprint of plastics and help materials be reused instead of being thrown away," researchers said. "It's a leap towards a cleaner, greener future, and it shows how creative chemistry can solve world challenges in a way that joins hands with nature."
(
C
)47. How did the team do the research?
① Heat the mixture. ② Leave the mixture in the air. ③ Recycle the chemical materials. ④ Mix a special metal and activated carbon with PET.
A.④②①③
B.④②③①
C.④①②③
D.④①③②
答案:C
解析：
【分析】
这是一道说明文阅读的细节排序题，解题核心思路是回到原文专门描述实验操作流程的段落，借助原文里的逻辑连接词逐一核对题干给出的四个操作的先后出现顺序：先定位到文章第二段的实验步骤描述，顺着流程类标识词依次梳理操作先后，最后匹配出正确排序对应选项即可，不需要额外推理，细心比对原文内容就能完成解题。
【解析】
回到原文第二段梳理实验完整操作顺序：
1. 原文第一步操作：The researchers mixed a special metal and activated carbon with PET，对应题干步骤④；
2. 用连接词Then引出的下一个操作：Then they heated the mixture，对应题干步骤①；
3. 用连接词Next引出的后续操作：Next, when the team left the material in the air，对应题干步骤②；
4. 用连接词Finally引出的收尾操作：Finally, these valuable chemical materials were recycled，对应题干步骤③。
因此四个步骤的正确顺序为④①②③，对应选项C，其余选项的顺序均和原文描述不符，可直接排除。
【答案】
C
【知识点】
阅读理解细节排序，说明文信息提取
【点评】
本题属于说明文阅读的基础题型，重点考查学生快速定位文本信息、梳理事件先后逻辑的能力，顺着原文的流程类连接词逐一匹配步骤就能轻松选出正确答案，易错点是粗心看错连接词对应的操作，颠倒加热和放置材料到空气中的先后顺序。
【难度系数】
0.8
