治疗慢性失血所致贫血宜选用：
A．维生素B12
B．叶酸
C．铁剂
D．维生素C
E．甲酰四氢叶酸钙
参考答案：C
For many cities in the world, there is no room to spread out further, _____ New York is an example.
A．for which
B．in which
C．of which
D．from which
后牙3/4冠邻沟位于邻面的
A．颊1/3B．颊1/3与中1/3交界C．中1/3D．中1/3与舌1/3交界E．舌l/3
