题目

He found an electronic dictionary on his way to school．He ______ and gave it to the teacher． A．pick it up             B．picked it up            C．picked up it 答案：B19．如图，点P是∠AOB的边OB上的一点．（1）过点P画OB的垂线，交OA于点C；（2）过点P画OA的垂线，垂足为H；（3）线段PH的长度是点P到直线OA的距离，线段PC的长是点C到直线OB的距离．