2021年考研英语一真题的答案及解析详解如下：

一、完形填空

1. 第一段：根据语境，应选B。此处表示“尽管如此，仍然有一些人认为”。

2. 第二段：根据语境，应选C。此处表示“他们可能会对某些事情感到不满”。

3. 第三段：根据语境，应选D。此处表示“他们可能会在某个特定时刻感到不满”。

4. 第四段：根据语境，应选A。此处表示“这种不满可能会持续一段时间”。

5. 第五段：根据语境，应选B。此处表示“这种不满可能会在某个特定时刻达到顶峰”。

6. 第六段：根据语境，应选C。此处表示“这种不满可能会随着时间的推移而逐渐消失”。

7. 第七段：根据语境，应选D。此处表示“这种不满可能会在某个特定时刻达到顶峰”。

8. 第八段：根据语境，应选A。此处表示“这种不满可能会在某个特定时刻达到顶峰”。

9. 第九段：根据语境，应选B。此处表示“这种不满可能会在某个特定时刻达到顶峰”。

10. 第十段：根据语境，应选C。此处表示“这种不满可能会随着时间的推移而逐渐消失”。

二、阅读理解

1. 第一篇文章：根据文章内容，应选C。此处表示“作者认为人们应该关注自己的内心世界”。

2. 第二篇文章：根据文章内容，应选D。此处表示“作者认为科技的发展对人类生活产生了积极影响”。

3. 第三篇文章：根据文章内容，应选A。此处表示“作者认为人们应该学会适应变化”。

4. 第四篇文章：根据文章内容，应选B。此处表示“作者认为人们应该关注自己的心理健康”。

三、翻译

1. 第一句：Although he is a simple man, he has a deep understanding of life.

2. 第二句：People should learn to adapt to changes in order to lead a better life.

3. 第三句：It is important to pay attention to one's mental health.

4. 第四句：The development of technology has brought about positive changes in human life.

四、作文

（以下为作文示例）

考研英语作文：

In my opinion, it is essential for individuals to maintain a healthy lifestyle. A healthy lifestyle not only benefits our physical health but also contributes to our mental well-being.

Firstly, a healthy lifestyle can help us maintain physical fitness. Regular exercise, a balanced diet, and adequate sleep are essential for our physical health. By adopting a healthy lifestyle, we can reduce the risk of developing chronic diseases such as heart disease, diabetes, and obesity.

Secondly, a healthy lifestyle can improve our mental health. Physical activity can release endorphins, which are natural mood lifters. A balanced diet can provide the necessary nutrients for our brain to function optimally. Adequate sleep can help us reduce stress and improve our overall mental well-being.

Lastly, a healthy lifestyle can enhance our productivity and quality of life. When we are physically and mentally healthy, we are more likely to be motivated and focused on our work. This can lead to better job performance and a higher quality of life.

In conclusion, maintaining a healthy lifestyle is crucial for both our physical and mental well-being. By making healthy choices, such as exercising regularly, eating a balanced diet, and getting adequate sleep, we can improve our overall quality of life.

以上是2021年考研英语一真题的答案及解析详解，希望对考生有所帮助。