Their affair is （）public knowledge

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Their affair is （）public knowledge
You need （）special knowledge to do this job 为什么这两个空分别不填?
knowledge是不可数名词,仅仅因为这个原因?
这两题中怎么都是泛指?为什么不是特指?

knowledge的基本用法分四类
1在具体指某方面的知识时,可以是可数名词,常用 a knowledge of 如：We need a guide who has a good of Chongqing's history.
其余三种用法都是不可数名词分别表示
了解,理解；
见闻,个人的见识；
学问,学识,常识
这里的两个问题都属于不可数名次中的第三类分别表示公共知识和专业知识.属于广泛的代指.宽范围的指代.不用于专指某件单个的物体或人
再问：那肯定有非公共和非专业知识啊，我觉得是特指

their affair is public knowledge. 请教英语冠词习题Their affair is （）public knowledgeYou need （）special A public affair的演员 Many college students find their knowledge is not enough for it is --- not to keep them secret with their knowledge knowledge is He is having an affair.. HE is having an affair. 冠词填空1.Thier affair is__public knowledge.2.You need __special 英语翻译knowledge is power. knowledge is power Knowledge is power 含义