上腔静脉的属支是（）
A.胸廓内静脉
B.椎静脉
C.甲状腺下静脉
D.奇静脉
E.锁骨下静脉
参考答案：D
The price system is a complex network _______ the prices of all the products bought and sold in the economy as well as those of a great number of services.
A．consisting of
B．consisted of
C．making up of
D．made up
重症肌无力的治疗方法有哪些
