题目

阅读下面短文,从短文后各题所给的四个选项(A,B,C和D)中,选出可以填入空白处的最佳选项。 Smith, an old man, lived in the middle of the town. One day he found his watch1in his own store. It 2a lot to him because it was from his wife. After searching3in the store for a long while, he 4to ask for help from a group of children playing outside the store. He5them that the person who found it would be rewarded. 6this, the children hurried inside the store, went through and around the 7store, but still could not find the watch. Soon the man felt hopeless and wanted to8. A已知△ABC中，A、B、C分别是三个内角，a、b、c分别是角A、B、C的对边，已知，△ABC的外接圆的半径为． （1）求C； （2）求△ABC面积S的最大值．