骨与关节结核发生率最低的部位是（）
A.肘关节
B.腕关节
C.髋关节
D.膝关节
E.椎体
参考答案：B
宜用明煅法炮制的药材是（）。
A.牡蛎
B.自然铜
C.炉甘石
D.磁石
E.棕榈
In my class, 75% students take the bus to school. So _______ students get to school by bus. [ ]
A. all
B. most
C. some
D. few
