题目

-- What’s the matter? You are crying! -- Nothing serious. The film ________ me ________ the times when I was a child. A. lets, think   B. reminds, of    C. makes, think    D. takes, to 答案：B设y1=a3x+5，y2=a-2x，（其中a＞0且a≠1），确定x为何值时，有：（1）y1=y2     （2）y1＞y2．