题目

There ________ a birthday party this Sunday.          A. shall be                  B. will be          C. shall going to be     D. will going to be 答案：B直角梯形ABCD中，AD∥BC，∠B=90°，AD+BC＜DC，若腰DC上有一点P，使AP⊥BP，则这样的点（ ）A．不存在B．只有一个C．只有两个D．有无数个