题目

 In ancient Egypt，the pharaoh（法老）treated the poor message runner like a prince when he arrived at the palace, if he brought good news. However，if the exhausted runner had the misfortune to bring the pharaoh unhappy news，his head was cut off.  Shades of that spirit spread over today’s conversations. Once a friend and I packed up some peanut butter and sandwiches for an outing. As we walked light-heartedly out of the door，picnic basket in hand，a smiling neighbor looked up at the sky and said，”Oh boy，bad day for a picnic. The weatherman says it’s going to rai作图与证明 按下列要求尺规作图（保留作图痕迹）：如图，已知∠ABC，在边AB上有一点D，请过点D用尺规作出与BC平行的一条直线，并将你的理由填写在横线上．理由： ．