Robert          business two years ago, but he didn't get along well at first for               experience.[      ]

A. pick up; want of  

B. put up; short of

C. set up; need of      

D. took up; lack of  

肝细胞对胆红素的转化在哪个部位进行( )

A．核糖体
B．粗面内质网
C．滑面内质网
D．胞浆
E．高尔基复合体