题目

Tired of Working in Your Country! With over 500 instructors and 20 years of experience, we are the leader in the field of teaching foreign languages. We now have positions open in Osaka starting September/October 2004 for instructors of English, German, Spanish and French. ?? Teach many different kinds of classes using the latest technology in small classes of up to 3 students. ??Accommodation （住宿）, and other necessary documents （文件） will be ready before you leave. ?? Applicants will teach their first language only. ?? Excellent teacher training programs. If you are young with 如图，在梯形ABCD中，AD∥BC，∠B=90°，AD=2，BC=5，tanC=．（1）求点D到BC边的距离；（2）求点B到CD边的距离．