题目

 If you want to open a file, please____ on the icon. A. left twice clicks B. left double clicks C. double left click D. twice left clicks 答案：C甲、乙两人分别同时由A、B两地出发相向而行，若v甲：v乙=5：3，则他们相遇时通过的路程s甲：s乙是    ．