Think about your goals. Consider where you would like to end up in the next five to ten years. This may be an entry-level position, but it could help you obtain the skills you need to get to where you want to go.
"Becoming an EMT will help me get closer to my goal of becoming a paramedic. I enjoy learning and I know that I will gain valuable experience that will help me in my career."
"This position, and company as a whole, will help me in my career by offering the strong growth potential that you do. I am really excited about the opportunities presented here."
"This position is right in line with my aspiration of managing. In my current role, I am an accounting clerk, this is a step up a financial analyst, and beyond that I want to be a controller."