Answer: 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 an article presents what the article will discuss. In other words, it is the part that introduces the subject matter of the article to the reader. The introduction is found at the beginning of an article. <u>The sentence "In 2008, more than one million American students gave nearly 20 million service hours to their communities" begins the introduction because it is the first sentence of the article and also because it anticipates what the text will be covering (community service). </u>