The sentence that begins the introduction of this article excerpt is In 2008, more than one million American students gave nearly 20 million service hours to their communities
Explanation:
The introduction of any kind of written work has to be made with a topic sentence, this kind of sentence is always the first or second sentence in a paragraph, each paragraph has a topic sentence of the first paragraph the one that introduces the main idea of the complete work, in this case for the full excerpt that would be "In 2008, more than one million American students gave nearly 20 million service hours to their communities"
