关键词：考研英语一、选题、答案
选题：以下是一篇考研英语一阅读理解的文章，请根据文章内容回答问题。
文章：
In recent years, the popularity of online education has soared, thanks to the convenience and flexibility it offers. However, some experts argue that this trend may have negative consequences for students' learning outcomes. One of the main concerns is that online learning can lead to a lack of social interaction, which is crucial for the development of communication skills and critical thinking. Moreover, the self-paced nature of online courses can make it difficult for students to stay motivated and disciplined.
Question: What is one of the main concerns about online education according to the article?
答案：One of the main concerns about online education according to the article is that it can lead to a lack of social interaction, which is crucial for the development of communication skills and critical thinking.
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