题目

________，people are beginning to realize how serious the situation is. A．Fortunate                                           B．Fortunately C．Being fortunate                                   D．Being fortunately 答案：副词Fortunately作状语，修饰整个句子，相当于It is fortunate that...。句意为：幸运的是，人们开始意识到形势的严峻性。 答案： B如图，若一个水平放置的图形的斜二测直观图是一个边长为1的正方形OABC，那么原平面图形的面积是（　　）A．22B．1C．2D．22