Which of the following statements is NOT true?（ ）
A、Prefixation is the formation of new words by adding suffixes to stems.
B、Prefixes do not generally change the word-class of the stem.
C、Prefixes only modify the meaning of the stem.
D、The chief function of prefixes is to change meanings of the stems.
【正确答案】：A
【题目解析】：本题得分的关键在于答出前缀法的含义及特点。A项表述错误。A项正确的表述应该是：Prefixation is the formation of new words by adding prefixes to stems. （前缀法是通过在词干前加上前缀构成新词的方法。）B项正确：前缀通常不会改变词干的词类。C项正确：前缀只修改词干的含义。D项正确：前缀的主要功能是改变词干的含义。
