A mother of a 4-month-old infant asks the nurse when she should wean from breast-feeding and begin using a cup. Which of the following would be the best indication of the infant's readiness to be weaned

A．Taking solid foods well.

B．Sleeping through the night.

C．Shortening the nursing time.

D．Eating on a regular schedule.

下列药物中，主要经肝代谢的是( )。

A．地高辛
B．毛花苷C
C．毒毛花苷K D．洋地黄毒苷
E．去乙酰毛花苷丙