【正确答案】：
SEMANTIC CHANGE MEANS AN OLD FORM WHICH TAKES ON A NEW MEANING TO MEET THE NEW NEED. THIS DOES NOT INCREASE THE NUMBER OF WORD FORMS BUT CREATE MANY MORE NEW USAGES OF THE WORDS, THUS ENRICHING THE VOCABULARY.
【题目解析】：本题考查语义变化的概念。Semantic change means an old form which takes on a new meaning to meet the new need. This does not increase the number of word forms but create many more new usages of the words, thus enriching the vocabulary.