Without proper lessons, you could __________a lot of bad habits when playing the piano. [ ]

A.give up    

B. catch up    

C. pick up    

D. keep up

Gilbert综合征是由于

A．肝细胞摄取非结合胆红素障碍

B．肝细胞内葡萄糖醛酸转移酶正常

C．肝细胞对某些阴离子(如靛青绿)向毛细胆管排泄障碍

D．肝细胞对结合胆红素摄取及结合障碍

E．肝细胞对结合胆红素排泄障碍