历史上，曾以北京作为京城的朝代是（ ） A．元、明、清 B．唐、元、明 C．宋、

每头奶牛每天挤奶15千克。   

①每头奶牛5天挤奶多少千克？                                        

②12头奶牛5天挤奶多少千克？                                       

综合算式是：                                       

答：                                                  

在资产阶级革命中，被送上断头台的国王是 [ ]

A、查理一世、查理二世

B、路易十六、路易十八

C、查理一世、路易十六

D、查理二世、路易十八

简述影响创伤修复的因素。

在数据库设计中，将E-R图转换成关系数据模型的过程属于

A．需求分析阶段

B．概念设计阶段

C．逻辑设计阶段

D．物理设计阶段

In bringing up children, every parent watches eagerly the child’s acquisition of each new skill—the first spoken words, the first independent steps, or the beginning of reading and writing. It is often tempting to hurry the child beyond his natural learning rate, but this can setup dangerous feelings of failure and states of worry in the child. This might happen at any stage. A baby might be forced to use a toilet too early; a young child might be encouraged to learn to read before he knows the meaning of the words he reads. On the other hand, though, if a child is left alone too much, or without any learning opportunities, he loses his natural enthusiasm for life and his desire to find out new things for himself.

Parents vary greatly in their degree of strictness towards their children. Some may be especially strict in money matters. Others are strict over times of coming home at night or punctuality tot meals. In general, the controls imposed represent the needs of the parents and the values of the community as much as the child’s own happiness.

As regards the development of moral standards in the growing child, consistency is very important in parental teaching. To forbid a thing one day and excuse it the next is no foundation for morality. Also, parents should realize that "example is better than precept". If they are not sincere and do not practise what they preach, their children may grow confused, and emotionally insecure when they grow old enough to think for themselves, and realize they have been to some extent fooled.

A sudden awareness of a marked difference between their parents’ principles and their morals can be a dangerous disappointment.

The word "precept" (Line 3, Para. 3) probably means ().

A．idea

B．punishment

C．behavior

D．instruction