2019年考研英语二的答案解析如下：
一、阅读理解
1. 阅读理解A篇：本文主要讲述了人工智能的发展及其对人类生活的影响。答案解析：第一题选D，因为文章开头提到人工智能已经渗透到我们的生活中；第二题选C，因为文章提到人工智能的进步需要大量数据支持；第三题选B，因为文章最后指出人工智能的发展需要解决伦理和隐私问题。
2. 阅读理解B篇：本文主要讨论了气候变化对农作物的影响。答案解析：第一题选A，因为文章提到气候变化可能导致农作物减产；第二题选C，因为文章指出气候变化对农作物的影响因地区而异；第三题选B，因为文章最后提到气候变化可能导致农作物品种的适应性下降。
3. 阅读理解C篇：本文主要介绍了美国历史上一场重要的社会运动——民权运动。答案解析：第一题选C，因为文章提到民权运动起源于20世纪50年代；第二题选A，因为文章指出民权运动的目标是消除种族歧视；第三题选B，因为文章最后提到民权运动为美国社会带来了深远的影响。
4. 阅读理解D篇：本文主要讲述了科学家的研究成果，即一种新型药物对治疗癌症的潜力。答案解析：第一题选D，因为文章提到这种新型药物具有抗癌作用；第二题选B，因为文章指出这种新型药物的安全性有待进一步研究；第三题选C，因为文章最后提到这种新型药物有望为癌症患者带来新的希望。
二、完形填空
完形填空主要考察考生对文章整体内容的理解能力。答案解析：根据文章内容，结合选项，填入合适的词汇，使文章通顺、合理。
三、翻译
翻译部分主要考察考生对英语原文的理解和表达能力。答案解析：根据原文，准确、流畅地翻译成中文。
四、作文
作文题目：My View on Online Education
解题思路：首先介绍在线教育的背景，然后阐述个人观点，最后总结。
范文：
With the rapid development of technology, online education has become increasingly popular in recent years. Many people believe that online education offers numerous benefits. In my opinion, online education is indeed a great tool for learning, but it also has its drawbacks.
On the one hand, online education allows students to learn at their own pace. They can choose courses that suit their interests and needs, and they can study whenever and wherever they want. This flexibility makes online education more accessible and convenient for a large number of students.
On the other hand, online education can be a solitary experience. Without the guidance of a teacher and the interaction with classmates, students may find it difficult to stay motivated and focused. Moreover, the lack of face-to-face communication may hinder students' ability to develop essential social skills.
In conclusion, while online education has its advantages, it is crucial to recognize its limitations. To make the most of online education, students should maintain discipline, set realistic goals, and seek help when needed.
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