题目

如图所示，AB为⊙O的直径，P点为其半圆上一点，∠POA=40°，C为另一半圆上 任意一点（不含A、B），则∠PCB=  ▲ 度．  答案：70解析:略 They are __________ the news we tell them． 　　A．surprise to hear　　B．surprising hear 　　C．surprised to hear D．surprised hear