In every cultivated language there are two great classes of words， which makes up the whol

e vocabulary. First， there are those words 56 which we become familiar in daily conversation， which we 57 ， that is to say， from the 58 of our own family and from our friends， and 59 we should know and use 60 we could not read or write. They 61 the common things of life with all the people who 62 the language. Such words may be called "popular"， since they belong to the people 63 and are not excluded 64 a limited class.On the other hand， our language 65 a large number of words which are com-paratively 66 used in ordinary conversation. Their meanings are known to every educated person， but there is little 67 to use them at home or in the market-place.Our 68 acquaintance （熟悉） with them comes not from our mother"s 69 or from the talk of our schoolmates， 70 from books that we read， lectures that we 71 ， or the more 72 conversation of highly educated speakers who are discus-sing some particular 73 in a style. properly higher above the habitual 74 of everyday life. Such words are called "learned"， and the 75 between them and the "popular" words is of great importance to a right understanding of language study process.根据以上内容，回答题。

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A.at

B.with

C.by

D.through