C
Scientists around the world are doing research on making toothbrushes out of wool now. Most toothbrushes we use every day are made of plastic, which brings pollution problems to the earth. The research is good for both people and the environment.
The wool used in the research is not the common type. Scientists choose soft and clean wool from healthy sheep, and then it goes through special processes to be suitable materials. First, they clean the wool. Next, they make the wool fibers（纤维）thin and straight to meet the needs of brushing teeth.
Finally, they fix the treated wool on toothbrush handles（柄）safely.
The new wool toothbrush has many advantages. It is soft enough and won't hurt people's gums（牙龈）during use. More importantly, it can break down naturally after being thrown away, so it won't cause plastic pollution. Tests show that the wool toothbrush can clean teeth as well as plastic ones, which makes it more possible to be used widely.
This research means a lot to environmental protection. With more and more plastic waste harming the earth, it's quite necessary to find green replacements. If wool toothbrushes come onto the market, they'll help reduce plastic waste greatly. ▲ It also encourages more scientists to develop other eco-friendly（对生态环境友好的）daily products for a greener world.
根据材料内容选择最佳答案。
()11. What's the role of Paragraph 1?
A. To tell a funny story.
B. To introduce the research topic.
C. To compare different toothbrushes.
D. To show how to use wool toothbrushes.
()12. Which is the right order of dealing with wool for toothbrushes?
① Fix wool on handles.
② Clean wool completely.
③ Make wool fibers thin.
A. ②→③→① B. ①→②→③
C. ③→②→① D. ②→①→③
()13. What can we learn about the wool toothbrush?
A. It is made of common wool.
B. It is harmful to people's gums.
C. It can reduce plastic pollution.
D. It cleans teeth worse than plastic ones.
()14. Which sentence can be put into the blank " ▲ " in Paragraph 4?
A. Wool toothbrushes are expensive to make.
B. Plastic toothbrushes will disappear soon.
C. People all refuse to use the wool toothbrush.
D. This is just another start of green product research.
()15. What's the main idea of the passage?
A. How to keep teeth clean daily.
B. Why plastic toothbrushes are popular.
C. Scientists' research on wool-made toothbrushes.
D. The history of different kinds of toothbrushes.

11. B 12. A 13. C
14. D 第四段前文讲羊毛牙刷对环保的意义，后文说鼓励科学家研发更多环保日用品，因此，选项D适合作为衔接句。
15. C

【分析】
本题为英语阅读理解题，共5道小题，涵盖段落作用、细节排序、细节理解、句子还原、主旨大意五类题型。解题思路如下：1. 通读全文，把握核心主题（科学家研发羊毛牙刷解决塑料污染）；2. 针对每道题定位原文对应内容，结合选项逐一排除：第11题分析第一段内容判断其作用；第12题根据原文步骤词梳理羊毛处理顺序；第13题定位羊毛牙刷的特点描述；第14题结合空格前后逻辑选衔接句；第15题归纳全文主旨。
【解析】
11. 第一段介绍全球科学家研究用羊毛制作牙刷以解决塑料污染问题，目的是引入该研究主题，故选B。A选项“讲有趣故事”、C选项“对比不同牙刷”、D选项“展示羊毛牙刷的使用方法”均不符合第一段内容。
12. 原文第二段提到处理羊毛的步骤：“First, they clean the wool（②）”“Next, they make the wool fibers thin（③）”，第三段“Finally, they fix the treated wool on toothbrush handles（①）”，正确顺序为②→③→①，故选A。
13. 原文第四段明确说明羊毛牙刷“it can break down naturally after being thrown away, so it won't cause plastic pollution”，即能减少塑料污染，对应C选项。A选项“由普通羊毛制成”与原文“不是普通类型的羊毛”不符；B选项“对牙龈有害”与原文“足够柔软不会伤害牙龈”不符；D选项“清洁牙齿比塑料牙刷差”与原文“清洁效果和塑料牙刷一样”不符。
14. 空格前讲羊毛牙刷对环保的意义，空格后提到“鼓励更多科学家研发其他环保日用品”，D选项“这只是绿色产品研究的另一个开始”能衔接前后逻辑，符合语境，故选D。A选项“制作成本高”、B选项“塑料牙刷很快消失”、C选项“人们都拒绝使用羊毛牙刷”均与上下文逻辑不符。
15. 全文围绕科学家对羊毛牙刷的研究展开，介绍研究背景、羊毛处理过程、羊毛牙刷的优点及环保意义，核心是科学家的羊毛牙刷研究，故选C。A选项“日常护牙方法”、B选项“塑料牙刷受欢迎的原因”、D选项“不同牙刷的历史”均偏离文章主旨。
【答案】11.B 12.A 13.C 14.D 15.C
【知识点】英语阅读理解、细节理解、主旨大意
【点评】本文是一篇环保主题的英语阅读理解，题型全面，侧重考查学生的信息定位和逻辑分析能力，解题需紧扣原文内容，避免主观臆断。
【难度系数】0.7