【正确答案】：
KNOWING THE SEMANTIC FEATURES OF THE HYPONYMS AND THEIR SUPERORDINATES CAN HELP US ACHIEVE VIVIDNESS,EXACTNESS,AND CONCRETENESS.IT IS NOT TOO DIFFICULT TO JUDGE THAT SENTENCE(B)IS BETTER THAN SENTENCE (A),BECAUSE IN (B)THE WRITER USES SUBORDINATES,WHICH ARE CONCRETE AND PRECISE,PRESENTING A VIVID VERBAL PICTURE BEFORE THE READER,WHEREAS IN (A)THE WORDS USED ARE SUPERORDINATES, WHICH CONVEY ONLY A GENERAL AND VAGUE IDEA. 
【题目解析】：了解下位词及其上位词的语义特征可以帮助我们实现生动、准确和具体。不难判断(b)句比(a)句好，因为在(b)句中，作者使用了具体而精确的从属关联词，向读者呈现了一幅生动的语言画面，而(a)句中使用了上级关联词，只传达了一个笼统而模糊的意思。