肝素：
A．在水溶液中带正电荷
B．在肝内被代谢失活
C．口服给药无效
D．天然存在于机体中
E．可引起严重血小板缺乏症
参考答案：B, C, D, E
Every year a flood of farmers arrive in Shenzhen for the money-making jobs they _____ before leaving their
hometowns. [ ]
A. promised
B. were promised
C. have promised
D. have been promised
男性，自幼常发生黄疸，贫血检查证实为遗传性球形细胞增多症，治疗最好采用（）
A.反复多次少量输血
B.糖皮质激素
C.脾切除
D.酌情应用免疫抑制剂
E.可不必治疗
