单选题   There is a ______ difference in meaning between the words 'liberty' and 'freedom'.
 
【正确答案】 C
【答案解析】形容词形异义异辨析。subtle表示“细微的,微妙的”,如:a subtle distinction between the two words两个词的细微差别。gentle意为“温和的,轻柔的”;humble指“地位(身份)卑微的,谦虚的,谦逊的”;weak一般表示“身体虚弱的,衰弱的”。