题目

 Expo 2010 Shanghai, ______ theme is Better City, Better Life, was the first World Exposition in a developing country. A. which               B. what                 C. where             D. whose 答案：D定语从句关联词。whose theme = the theme of Expo 2010。如图，AB是⊙O的直径，C是圆上一点，过C作CD⊥AB于D，如果延长CD一倍到E，那么E点的位置是 [　　] A．在圆内B．在圆上C．在圆外D．不一定在圆上