考研真题答案英语：
1. 问题：What are the three main causes of the industrial revolution in the 18th century?
答案：The three main causes of the industrial revolution in the 18th century are the Agricultural Revolution, the discovery of new energy sources like coal and steam, and the technological advancements in manufacturing.
2. 问题：Describe the function of the mitochondria in cells.
答案：The mitochondria are known as the "powerhouse" of the cell because they produce most of the cell's supply of adenosine triphosphate (ATP), used as a source of chemical energy.
3. 问题：What is the significance of the Declaration of Independence?
答案：The Declaration of Independence is significant as it announced the independence of the thirteen American colonies from Great Britain, serving as a foundational document for the United States.
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