单选题 In every cultivated language there are two great classes of words. They, taken together, (26) the whole vocabulary. First, there are those words (27) which we become familiar in ordinary conversation, which, we learn, (28) is to say, from the members of our own family and from our friends, and which we should know and use (29) we could not road or write. They . (30) the common things of life, and are the stock in trade of (31) who speak the language. Such words may be called "popular", since they belong to the people (32) and are not the (33) of a limited class only.
On the other hand, our language includes a large number of words which are (34) seldom used in ordinary conversation. Their meanings are known to every (35) person, but there is little (36) to use them at home. Our first (37) with them comes not from our mother's lips or from the talk of our classmates, (38) from books that we read, lectures that we hear, or the more formal conversation of (39) educated speakers who are discussing some particular topic in an elevated (40) . Such words are called "learned", and the difference between them and "popular" words is (41) great importance to a right understanding of language. We may (42) a girl as "lively" or as "vivacious. "In the first (43) , we are using a native English word (44) from the familiar noun "life". In the (45) , we are using a Latin derivative which has exactly the same meaning.