肩袖的组成有（）
A.冈上肌
B.冈下肌
C.肩胛下肌
D.小圆肌
E.胸大肌
参考答案：A, B, C, D
_________a reply, he decided to write a sixth letter.
A．Not receiving
B．Not to receive
C．Not having received
D．Having not received
雌激素是合成孕激素的前体。
