听力原文：Feeling run down? Low on energy? Then it's time for you to rev up. One package of Rev Up contains enough vitamins and minerals to energize you for five straight hours. And you won't be even more tired than when you started. Rev Up contains more than 100 percent of the vital nutrients your body needs to help you think clearly and perform. efficiently. Rev Up comes in three flavors—grape, lime and cherry—and is available at supermarkets throughout the urban area. When you're down, rev it up, with Rev Up. What is being advertised?