在21年考研英语二中，阅读理解部分考察了考生对英语文章的快速阅读和理解能力。以下是一篇原创的阅读理解练习：
题目：
In the past, the primary concern of businesses was to maximize profits. However, in recent years, there has been a growing recognition that businesses have a responsibility to society beyond just generating profits. This shift in perspective has led to the emergence of a new business model known as "social entrepreneurship."
文章摘要：
Social entrepreneurship involves creating businesses that are both profitable and socially responsible. These businesses aim to solve social problems while also making a profit. One example of a social entrepreneur is Elon Musk, the CEO of Tesla and SpaceX. Musk's companies are not only profitable but also committed to sustainable energy and reducing carbon emissions.
问题：
What is the main idea of the passage?
选项：
A. The importance of social entrepreneurship in today's business environment.
B. The challenges faced by social entrepreneurs.
C. The history of business models.
D. The personal achievements of Elon Musk.
答案：
A. The importance of social entrepreneurship in today's business environment.
解析：
本文主要探讨了社会企业家的兴起及其在当今商业环境中的重要性。文章通过引用Elon Musk的例子，说明了社会企业家的理念是如何在实践中得到体现的。
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