题目

阅读下列短文，从文后各题所给的四个选项中选出一个最佳答案。 Where did you go yesterday? Did you hear 1at any of those places? Today most stores and restaurants play music. You might even hear music in an office or on a farm. Scientists believe that music changes the 2people behave. According to some scientists, the sound of Western classical music makes people 3 richer. When a restaurant plays classical music, people spend more money on food and drinks. When the restaurant plays 4 music, people spend less money. With 5 music, people spend even less. Scientists also 一只蚂蚁在立方体的表面积爬行．（Ⅰ）如图1，当蚂蚁从正方体的一个顶点A沿表面爬行到顶点B，怎样爬行路线最短？说出你的理由．（Ⅱ）如图1，如果蚂蚁要从边长为1cm的正方体的顶点A沿最短路线爬行到顶点C，那么爬行的最短距离d的长度应是下面选项中的（　　）（A）1cm＜l＜3cm    （B）2cm       （C）3cm这样的最短路径有______条．（Ⅲ）如果将正方体换成长AD=2cm，宽DF=2cm，高AB=1.5cm的长方体（如图2所示），蚂蚁仍需从顶点A沿表面爬行到顶点E的位置，请你说明这只蚂蚁沿怎样路线爬行距离最短？为什么？（可通过画图测量来说明）