Adrian's hard work _______. He graduated with good grades and got into a top high school.

He also achieved a lot in life outside school. [ ]

A. paid off        

B. paid back          

C. paid for          

D. paid out

生后3天的女婴，一般情况好，血红细胞5.5×10¹²/L，血红蛋白：170g/L，网织红细胞：1.5%，血涂片发现计数100个红细胞时有3～4个有核红细胞，提示（）

A.真性红细胞增多症

B.新生儿轻度贫血

C.新生儿溶血症

D.新生儿溶血症的先兆

E.正常现象