题目

Zebra crossings - the alternating dark and light stripes on the road surface - are meant to remind drivers that pedestrians may be trying to get across. Unfortunately, they are not very effective. A 1998 study done by the Department of Traffic Planning and Engineering at Sweden's Lund University, revealed that three out of four drivers maintained the same speed or even speeded up as they were approaching a crossing. Even worse? Only 5% stopped even when they saw someone trying to get across.Now a mother-daughter team in Ahmedabad , India has come up with a clever way to get drivers to 将长度为7cm的线段向上平移10cm所得线段长度是 [     ]A.10cm B. 7cm C.0cm D.无法确定