斧状脸
参考答案：
当肌萎缩累及面肌、咬肌、颞肌和胸锁乳突肌时，患者呈现面容瘦长，颧骨隆起，称斧状脸。
设△ABC的内角A、B、C所对边的长分别为a、b、c，且有2sinBcosA=sinAcosC+cosAsinC．
（1）求角A的大小；
（2）若b=2，c=1，D为BC的中点，求AD的长
He is new here. He has few friends, _____? [ ]
A. has he
B. hasn't he
C. does he
D. doesn't he
