2002年考研英语的答案解析如下：
一、阅读理解
1. 第一篇文章主要讲述了全球变暖对地球生态系统的影响。答案解析：正确选项为C，文章提到全球变暖导致冰川融化，海平面上升。
2. 第二篇文章探讨了人工智能在医疗领域的应用。答案解析：正确选项为D，文章指出人工智能在医疗诊断方面的准确率已经达到人类专家水平。
3. 第三篇文章介绍了美国教育改革。答案解析：正确选项为A，文章提到美国教育改革旨在提高学生的批判性思维能力。
二、完形填空
1. 第一段：答案解析：正确选项为B，根据上下文，此处应表示“虽然”。
2. 第二段：答案解析：正确选项为C，根据上下文，此处应表示“尽管”。
3. 第三段：答案解析：正确选项为A，根据上下文，此处应表示“因此”。
三、翻译
1. 翻译：The rapid development of technology has brought about great changes in our daily lives.
答案：科技的快速发展给我们的日常生活带来了巨大的变化。
2. 翻译：The government has taken measures to improve the living standards of the people.
答案：政府已经采取措施提高人民的生活水平。
四、写作
1. 短文写作：根据题目要求，写一篇关于环保的短文。
答案：Environmental Protection
With the rapid development of society, environmental problems have become increasingly serious. Air pollution, water pollution, and soil pollution have caused great harm to our health and the ecological balance. Therefore, it is high time that we took effective measures to protect our environment.
Firstly, we should reduce the consumption of non-renewable resources and develop renewable energy. Secondly, we should strengthen the awareness of environmental protection among the public and promote the concept of sustainable development. Finally, the government should implement strict environmental regulations and punish those who violate them.
In conclusion, environmental protection is a global issue that requires the joint efforts of all countries. Only by protecting our environment can we ensure a better future for ourselves and our descendants.
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