计算机内部CPU的功能为( )。
A．负责各种运算和控制工作
B．协调计算机各种操作
C．进行数据处理
D．完成输入输出操作
参考答案：A
睡前服( )
A．泻药硫酸钠B．催眠药苯巴比妥C．止吐药胃复安D．助消化药胃蛋白酶E．驱虫药左旋咪唑
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.
