题目

阅读下面短文，根据所给情节进行续写，使之构成一个完整的故事。It was the hottest time ofthe year in southern California. Steve, a star basketball player at theUniversity of California, with his cousin Zach, had planned a camping trip inthe Great National Forest for their summer vacation.The boys packed clothes andsupplies into a bag, and began their great adventure with the dog Bradyearly in the morning. Upon arrival, Steve pulled over to the side of the roadalong the bank of the river. A wonderful place for fishing,Steve exclaimed in delight. Zach nodded in agreeme如图，在半径为30 m的圆形广场中央点O的上方安装一个照明光源S，S射向地面的光束呈圆锥形，其轴截面SAB的顶角为120°，求光源距离地面的垂直高度SO.(精确到0.1m，≈1.414，≈1.732，≈2.236，以上数据仅供参考)