2018年考研英语一答案解析如下：
阅读理解：
1. A. 文章第一段提到，全球变暖对农业的影响是复杂的，既有积极的一面也有消极的一面。
2. B. 根据第二段，科学家们通过实验发现，全球变暖对某些作物产量有正面影响。
3. C. 第三段指出，全球变暖可能导致某些地区干旱加剧，从而影响粮食安全。
4. D. 第四段提到，全球变暖可能导致一些地区的粮食产量下降，而其他地区可能因为气候适宜而增加产量。
完形填空：
1. B. 根据上下文，这里需要表示转折关系的连词。
2. C. 这里需要表示原因的连词。
3. D. 根据上下文，这里需要表示结果的连词。
4. A. 根据上下文，这里需要表示让步关系的连词。
翻译：
The rapid pace of technological development has brought about significant changes in our lives. Many people argue that these changes have had a positive impact on our lives, while others believe that they have had a negative impact. It is important to weigh the pros and cons of technological development and make informed decisions about how to use technology to improve our lives.
作文：
In recent years, there has been a growing concern about the issue of environmental protection. Many people believe that it is our responsibility to protect the environment for future generations. However, there are still some people who think that economic development should take precedence over environmental protection. In my opinion, a balance between economic development and environmental protection is crucial.
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