题目

方程|x-1|=的正实数根的个数是 .(第4题) 答案：1 【解析】在同一平面直角坐标系中分别画出函数y=|x-1|和y=的图象如图所示，由图象可知两者只有1个交点，所以方程只有1个正根.There are lots of things _______ I need to prepare before the trip. [     ]A. who B. that C. whom D. whose