[单项选择]In every cultivated language there are two great classes of words which, taken together, comprise the whole vocabulary. First, there are those words with which we become acquainted in ordinary conversation, which we learn, that is to say, from the members of our own family and from our familiar associates, and which we should know and use even if we could not read or write. They concern the common things of life, and are the stock in trade of all who speak 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.
On the other hand, our language includes a multitude of words which are comparatively seldom used in ordinary conversation. Their meanings are known to every educated person, but there is little occasion to employ them at home or in the market-place. Our first acquaintance with them comes not from our mother’s lips or from the talk of our schoolmates, but from books that we read, lect
A. the two kinds of words, popular and learned words, are both important in a cultivated language
B. it is easy to learn popular words in a language
C. we must make great efforts to learn learned words
D. learned words are more important than popular words