题目内容：
In every cultivated language there are two great classes of words, which makes up the whole vocabulary. First, there are those words56which we become familiar in daily conversation,which we57, that is to say, from the58of our own family and from our friends, and 59we should know and use60we could not read or write. They 61the commonthings of life with all the people who62the language. Such words may be called "popular",since they belong to the people63and are not excluded64a limited class.
On the other hand, our language65a large number of words which are comparatively66used in ordinary conversation. Their meanings are known to every educated person, but there is little67to use them at home or in the market-place. Our68acquaintance (熟悉)with them comes not from our mother' s69or from the talk of our schoolmates,70frombooks that we read, lectures that we71, or the more72conversation of highly educated speakers who are discussing some particular73in a style properly higher above the habitual 74of everyday life. Such words are called "learned", and the75between them and the"popular" words is of great importance to a right understanding of language study process. A．at
B．with
C．by
D．through
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