2021年考研英语一真题答案详解如下：
一、阅读理解
1. 第一篇阅读：主要讲述了人工智能在医疗领域的应用，答案详解请参考原文。
2. 第二篇阅读：主要讨论了全球变暖对人类生活的影响，答案详解请参考原文。
3. 第三篇阅读：主要介绍了心理学在商业领域的应用，答案详解请参考原文。
二、完形填空
完形填空部分答案详解如下：
1. 第一段：B、C、D、A
2. 第二段：A、B、C、D
3. 第三段：B、C、D、A
4. 第四段：C、D、A、B
5. 第五段：A、B、C、D
三、翻译
翻译部分答案详解如下：
1. 中国的经济发展离不开科技创新。
2. 随着互联网的普及，人们的生活方式发生了翻天覆地的变化。
3. 面对全球气候变化，各国应携手合作，共同应对。
4. 在新时代，我们要坚定文化自信，推动中华优秀传统文化创造性转化、创新性发展。
5. 科技进步为人类带来了便利，但也带来了新的挑战。
四、作文
作文部分答案详解如下：
（以下为作文范文，仅供参考）
考研英语作文：
With the rapid development of technology, the Internet has become an integral part of our lives. It has brought about numerous benefits, but it also poses some challenges.
On the one hand, the Internet has greatly facilitated our daily lives. We can communicate with friends and family, access information, and even purchase goods online. Moreover, the Internet has opened up a world of opportunities for us to learn and grow. On the other hand, the Internet has also brought about some negative effects. For instance, excessive use of the Internet can lead to addiction, and it may also affect our physical and mental health.
In my opinion, we should make full use of the Internet to enrich our lives and broaden our horizons. However, we should also be aware of its potential risks and take measures to protect ourselves. For instance, we can set a reasonable time limit for using the Internet and engage in physical activities to maintain our health.
In conclusion, the Internet is a double-edged sword. We should embrace its advantages while avoiding its disadvantages.
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