题目

   Theme park getaways are popular with families, but they sure aren’t cheap. Happily, there are some golden rules of ticket-buying that apply to pretty much every theme park, and they can help you chip away at the cost of tickets. 36    •Buy tickets online.    Never ever pay the walk-up ticket price at a theme park. 37 You’re guaranteed to save a significant sum—sometimes as much as $ 20 per ticket—even for same-day tickets.    •Buy in advance.    38  For instance，Knott’s Berry Farm in Buena Park, California, slices off $25 per ticket when you make your pur如图，AB，BC，CA是⊙O的三条弦，∠OBC=50°，则∠A=（　　）A．25°B．40°C．80°D．100°