使声带变长的肌肉是
A．环甲肌
B．甲杓肌
C．杓间肌
D．杓会厌肌
E．环杓后肌
参考答案：A
有一边长为1的等腰三角形，它的另两边是方程x2-4x+k=0的两根，则k=______．
Who teaches_____ English? [ ]
A. their
B. them
C. theirs
D. they
