申请退关货物发货人应当在退关之日起( )天内向海关申报退关，经海关核准后方能将货物运出海关监管场所。
A．2
B．3
C．5
D．7
参考答案：B
For the most part, schools are ________ to produce people who fit into society, not people who set
out to change it. [ ]
A. established
B. designed
C. admitted
D. signed
真皮的中蛋白多糖包括（）
A.，花生四烯酸
B.透明质酸
C.硫酸软骨素
D.亚油酸
