【正确答案】：
WORDS THAT HAVE EMOTIVE VALUES MAY FALL INTO TWO CATEGORIES: APPRECIATIVE OR PEJORATIVE. WORDS OF POSITIVE OVERTONES ARE USED TO SHOW APPRECIATION OR THE ATTITUDE OF APPROVAL, WHILE THOSE OF NEGATIVE CONNOTATIONS IMPLY DISAPPROVAL, CONTEMPT OR CRITICISM.
THE APPRECIATIVE OR PEJORATIVE MEANINGS OF THE WORDS ARE USUALLY BROUGHT OUT IN CONTEXT.
IN SENTENCE A, AMBITION UNDOUBTEDLY CONVEYS A PEJORATIVE OVERTONE, ALONG WITH THE OTHER TWO WORDS ENVY AND GREED, WHILE IN SENTENCE B , THE SAME WORD AMBITION IS OBVIOUSLY USED IN GOOD SENSE, SHOWING APPROVAL ON THE PART OF THE SPEAKER, TOGETHER WITH THE WORDS WORK HARD.
【题目解析】：有情感价值的词可以分为两类：褒义词或贬义词。带有积极意味的词语被用来表示赞赏或赞同的态度，而消极内涵的词语则意味着不赞成、蔑视或批评。这些词的赏识或贬义通常是在语境中表达出来的。在句子A中，ambition（野心）和另外两个词envy（嫉妒）和greed（贪婪）一样，无疑是带有贬义的语气。而在句子B中，ambition（野心）这个词显然是在褒义上使用的，加上work hard（努力工作）的词语，表明说话人的赞同。