题目

完形填空 ZhangLei is a highly skilled（技艺精湛的） doctor. He was bornin a lonely1village. The people there lived a hardlife. They seldom walked out of the mountain. They could2get good education. However, Zhang Leiwas3, for he not only went to college, but he also became an excellentdoctor. Then what made him lucky? A volunteer teacher called Han Xue encouragedhim, and4his life. WhenHan Xue first entered Zhang Lei's school, she couldn't5hereyes. She was shocked by the sights（情景） infront of her: broken windows, small old desks and chairs. Even worse, studentsof different ag在△ABC中，角A、B、C所对的边长分别是a，b，c，且满足sinC-sinBcosA=0．（1）求角B的值；（2）若cosA2=255， c=3，求△ABC的面积．