题目

 ----Welcome to 9 o’clock Weekend Talk. ___________ do you think about Sports News?   ----I like it.        A. What                B. How                        C. Why                        D. Where 答案：A在数列｛an｝中，a1=9,且对任意大于1的正整数n,点(,)在直线x-y-3=0上，则=__________________.