题目内容：
根据短文内容，回答题。In every cultivated language there are two great classes of words which，taken together，comprises the whole vocabulary．First，there are those words _____51_____ which we become acquainted in daily conversation，which we learn，that is to say，from the _____52_____ 0f our own family and from our familiar associates，and which we should know and use _____53_____ we could not read or write．They concern the common things of life，and are the stock in trade of all who _____54_____ the language．Such words may be called “popular”，since they belong to the people at large and are not the exclusive possession of a limited class．
0n the other hand．our language comprises a multitude of words which are comparatively _____55_____ used in ordinary conversation．Their meanings are known to every educated person， but there is little _____56_____ to use them at home or in the market place． Our first acquaintance with them comes not from our mother’s _____57_____ or from the talk of our school mates，_____58_____ from books that we read．1ectures that we attend， or the more formal conversation of highly educated speakers who
are discussing some particular _____59_____ in style appropriately elevated above the habitual extent of everyday life． Such words are called “learned”，and the _____60_____ between them and the “popular” words is of great importance to a right understanding of linguistic process.
___________ A．at
B．with
C．by
D．through
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