题目

二次函数y=ax2+b（b＞0）与反比例函数y=在同一坐标系中的图象可能是(     ) A．   B．    C．    D． 答案：B【考点】二次函数的图象；反比例函数的图象． 【专题】数形结合． 【分析】先根据各选项中反比例函数图象的位置确定a的范围，再根据a的范围对抛物线的大致位置进行判断，从而确定该选项是否正确． 【解答】解：A、对于反比例函数y=经过第二、四象限，则a＜0，所以抛物线开口向下，故A选项错把下列句子重新排序，组成一段完整的对话。A. Can I speak to Jim, please?B. When is John’s birthday?C. I am making a birthday chart for our class. I don' t know yours, John's and Sue's, when is your birthday?D. My birthday is in December. Oh, Sue’s birthday is in December, too.E. This is Jim speaking. What are you doing?F. Not at all.G. Thank you.H. It is on October 3rd.正确的顺序：________________________________________