题目内容
儿童在知道“苹果”、“梨子”和“香蕉”等概念之后，再学习“水果”概念，这种学习是（）
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The instinct, common among people of all ages, for keeping apparently useless【C1】_______has never ceased to appeal to me. I do not mean【C2】_______collecting, such as stamps or old china,【C3】_______the habit so many of us have of keeping things in case they【C4】_______in "handy". This is especially true of【C5】_______such as shoes, sweaters and ancient raincoats which, though out of【C6】_______and worn-out, remain hanging in our wardrobes【C7】_______looked at or put on, but just comfortingly there.An old man who lived next door to us at one time used to【C8】______newspapers. He simply could not bear to【C9】_______a newspaper away, though once he had read it, he never glanced at it【C10】_______When he died at close【C11】_______ninety, two rooms of his house were filled with yellow newspapers which had become【C12】_______for several families of mice. Then an aunt of mine had a passion 【C13】_______collecting string. To throw away a piece of string was to commit a deadly【C14】_______in her eyes. No piece of string was【C15】_______short to escape her attention.She saved the string off parcels and packages of all sorts,even luggage labels. Christmas was a torture for her,【C16】_______she could not bear to see us taking scissors to【C17】_______the string round our brightly【C18】_______Christmas presents, and would sit anxiously watching, repeatedly diving to the floor to【C19】_______an end that had been carelessly thrown away. It was a terrible blow to her when sticky tape【C20】_______general use-in fact she did not survive it long.
【C1】
恒定流指的是（）。
三相交流异步电动机铭牌上所标示的额定功率值是电动机的（）。
在面向对象技术中，类是关于一组对象的共同特性的抽象，其泛化关系是指(34)，聚合关系是指(35)，(36)是对象的特性的表现。
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