阅读理解。阅读下列短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。
It’s 5:00 in the morning when the alarm (闹钟) rings in my ears. I roll out of bed and walk blindly through the dark into the bathroom. I turn on the light and put on my glasses. The house is still as I walk downstairs while my husband and three kids sleep peacefully. Usually I go for a long run, but today I choose my favorite exercise DVD insanity. Sweat pours down my face and into my eyes. My heart races as I face my body to finish each movement. As I near the end of the exercise, I feel extremely tired, but a smile is of my face. It’s not a smile because the DVD is over, but a smile of success from pushing my body to its extreme limit.
