C
You might see everything you see or hear on the internet makes you more sure of what you already think. If this happens, be careful! You might be in something called an information cocoon (茧房)—a place where your own ideas keep coming back to you.
This isn't something new. Think about ancient times when people sat around a campfire. They only shared stories that their group believed and agreed with. Today, the internet and social media are like our modern campfire. They connect people all over the world. But just like the old campfire, they also let people share and hear the ideas they already like. ①
You might have noticed that social media ads seem to know what you like. This happens because of a computer programme called algorithms(算法). Algorithms are like sets of rules that help computers do things. Every time you click(点击) likes or share something, you leave a "digital footprint(数字脚印)". This helps algorithms learn what you like. Then they show you more of the same kind of content(内容). ②
Information cocoons can make you feel good, but they also have some bad results. ③ When you only see similar opinions, it's hard to accept different views. This can make it hard for us to understand people who think differently.
Information cocoons can also lead to more arguments(争论) and worries among people. This often makes different groups in society disagree with or do not trust each other even more. ④
The good news is that there are ways to break out of the information cocoon. One important thing is to look for different kinds of information. Also, it's important to learn how to think critically(批判地). This means checking the facts and being open to changing your mind.
By doing these things, you can break out of the information cocoon and see a wider world!
()48. Why does the writer talk about "ancient campfire" in Paragraph 2?
A. To encourage people to spend much more free time outdoors.
B. To show that people always like sharing similar ideas in groups.
C. To suggest that technology has made talking with others worse.
D. To show why life in the past was more interesting than it is today.
()49. According to the passage, a "digital footprint" is .
A. a fun thing to play on the internet
B. something secret in your computer
C. a number you use to enter a website
D. a record of what you click or share online
()50. We can put the sentence "This is why we need to solve this problem." in .
A. ① B. ② C. ③ D. ④
()51. What does the writer think of the information cocoon?
A. It is not good or bad, just a fact.
B. It is hard to tell if it is good or bad.
C. It is a problem and we should try to break it.
D. It is good because it makes people feel happy.

C [文章大意]本文是一篇说明文。文章介绍了信息茧房的定义(人们只接触与自己观点一致的信息，形成封闭的信息环境)，还追溯了其历史(古代篝火旁只分享相同观点)，说明算法是现代信息茧房的形成原因，信息茧房会导致人们难以接受不同观点、引发争论，最后提出破解方法:接触不同信息、批判性思考。
[图1 第5题图]
48.B [解析]推理判断题。根据“This isn't something new. Think about ancient times when people sat around a campfire. They only shared stories that their group believed and agreed with. Today, the internet and social media are like our modern campfire.”可知，作者提到古代篝火是为了说明人们一直以来都喜欢在群体中分享相似的观点，信息茧房不是新现象。故选B。
49.D [解析]细节理解题。根据“Every time you click(点击) likes or share something, you leave a ‘digital footprint(数字脚印)’. This helps algorithms learn what you like.”可知，数字足迹是你在网上点击或分享内容的记录。故选D。
50.D [解析]句子还原题。句子“This is why we need to solve this problem.”意为“这就是我们需要解决这个问题的原因”，应放在介绍完信息茧房的所有负面影响之后，引出破解方法。④处前面是信息茧房的第二个负面影响(引发争论和担忧)，后面是破解方法的介绍，符合语境。①处前是介绍信息茧房的历史溯源，②处前是介绍算法的作用，③处前是引出负面影响，均不符合。故选D。
技巧点拨 句子还原题解题步骤:1. 分析待还原句子的语义，明确其承上启下的作用;2. 梳理原文各段落的逻辑结构，找到对应语义的位置;3. 验证句子放在该位置是否符合上下文逻辑。
51.C [解析]观点态度题。根据“Information cocoons can make you feel good, but they also have some bad results.”和“The good news is that there are ways to break out of the information cocoon.”可知，作者认为信息茧房是一个问题，我们应该努力解决它。故选C。
素养考向 本篇阅读理解要求学生能理解说明文的逻辑结构，完成细节理解、推理判断、句子还原等题目，提升语篇逻辑分析能力;同时通过介绍信息茧房的影响，引导学生树立批判性思维，学会接触多元信息，培养开放的心态。