下列哪项是新生儿ABO溶血病主要的临床表现（）。
A.黄疸常出现早
B.贫血常常很重
C.常有心力衰竭
D.常有肝、脾肿大
E.可出现胎儿水肿
参考答案：A
常用的浸提方法包括( )
A．法 B．水蒸气蒸馏法 C
B．超滤法
C．盐析法
----- As we know, you won’t go back to the USA since you have established a research center here．But how long _____ in America?
----- For almost 10 years．
A．did you study
B．have you studied
C．were you studying
D．have you been studying
