促红细胞生成素（EPO）的产生部位主要是（）。
A.肝
B.肾脏
C.脾
D.骨髓
E.血液
参考答案：B
A British man who ____ to play practical jokes ____ his own humorous art work in four major New York museums over the last two weeks.
A．liked; has secretly hung
B．likes; has secretly hung
C．had liked; secretly hung
D．has liked; secretly hung
国有土地使用权租赁可实行什么租赁？短期租赁不可超过多少年？
