题目

单项选择 We decided to ____ Tom to be the chief editor and vote ____ Cindy to be the secretary.     A．elect; to   B．choose; to    C．pick out; for   D．elect; for 答案：D（2011•湖北模拟）已知△ABC的三内角A，B，C所对三边分别为a，b，c，且sin（π4+A）=7210，0＜A＜π4．（I）求tanA的值．（II）若△ABC的面积s=24，b=8求a的值．