题目

To keep healthy,Professor Johnson _______ cycling as a regular form of exercise after he retired. A. caught on B. set out C. made for D. took up 答案：D 解析: take up意思是“占据，占领，从事”。（2010•广州）目前世界上最高的电视塔是广州新电视塔．如图所示，新电视塔高AB为610米，远处有一栋大楼，某人在楼底C处测得塔顶B的仰角为45°，在楼顶D处测得塔顶B的仰角为39°．（1）求大楼与电视塔之间的距离AC；（2）求大楼的高度CD（精确到1米）．