题目

已知四棱锥的三视图如图所示,则此四棱锥的侧面积为 （    ）    A．              B．          C．             D． 答案：C ；当你问别人时间时，你应说：（ ）A. Excuse me, what time is it? B. What time it is?C. How old is it? D. How far is it?