题目

 _____ opening ceremony of the 29th Beijing Olympic Games really gave the world ____ big surprise.     A. /;a           B. The; the         C. /;the    D. The; a 答案：D已知，若与成正比例关系，与成反比例关系，且当x=－1时，y=3，当x=1时，y=－3，求y与x的函数关系式．