Homer综合征的出现是由于甲状腺肿大压迫了（）。
A.颈交感干
B.迷走神经
C.喉返神经
D.喉上神经
E.喉下神经
参考答案：A
Catherine bought a postcard of the place she was visiting, addressed______to _____and then posted it at the nearby post office．
A．it; her
B．it; herself
C．herself; her
D．herself; herself
区群组成应满足的两个条件是什么？
