题目

Live the ‘American Dream’ What is it: Work & Travel USA Who are qualified: Full-time college students, above 18 years old. About the program: Application for the 2009 Work & Travel USA program has just started. It’s an 8-16 week summer program for college students to work and travel in the US. Employers include Boeing, Hilton Hotel and 7-Eleven. For next summer, about 3,500 positions are open to Chinese Students. Applicants must pass a language test and sometimes an interview, and pay a registration fee to join the program.                  (source: www. culture函数y=2x-13x-4的值域是（　　）A．（-∞，43）∪（43，+∞）B．（-∞，23）∪（23，+∞）C．RD．（-∞，23）∪（43，+∞）