铁剂治疗营养性缺铁性贫血，血红蛋白达正常后继续用药的时间是（）
A.1周
B.2周
C.4周
D.6周
E.8周
参考答案：E
Jasmine was holidaying with her family in a wildlife park _____ she was bitten on the leg by a lion. [ ]
A. when
B. while
C. since
D. once
死胎是指妊娠多少周胎儿在子宫内死亡：
A．18周B．20周C．24周D．26周E．28周
