题目

 Customers are asked to make sure that they ____ the right change before leaving the shop.A. will give  B. have been given     C. have given                D. will be given 答案：B已知某几何体的俯视图是如图所示的矩形，正视图是一个底边长为8，高为4的等腰三角形，侧视图(或称左视图)是一个底边长为6，高为4的等腰三角形．(1)求该几何体的体积V；(2)求该几何体的侧面积S．