结构化分析(SA)方法是一种( )。

A．自顶向下逐层分解的分析方法

B．自底向上逐层分解的分析方法

C．面向对象的分析方法

D．以上都不对

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.