This question has two parts. First, answer Part 1. Then, answer Part 2. Part 1 Read this excerpt from the introduction to Wheels of Change by Sue Macy. When I was a kid, I took great pleasure in jumping on my bike and riding to the corner candy store about half a mile away. Although I had no knowledge of the part the bicycle had played as a vehicle of change for turn-of-the-20th-century women, I was acutely aware that it allowed this 1960s girl a unique measure of independence. On my bike, I could break free of the bonds that held me in my neighborhood to go buy Necco Wafers and candy necklaces and Atomic FireBalls. If I felt particularly adventurous, I could even ride a bit farther for a fresh ice-cream cone at Applegate Farm. What is the central idea of the excerpt?