第五题关键词是用特殊字体标注的超纲词汇，定位到第3个小标题Less smoking第一段末句“It probably has something to do with the fact that nicotine （尼古丁） is an appetite suppressant and appears to up your metabolic rate”。根据对短语appetite suppressant（食欲遏制剂）的理解可以判断选项A) It threatens their health. B) It heightens their spirits. C) It suppresses their appetite. D) It slows down their metabolism.中正确答案是C)，四个选项中可能只有suppressant一词是大部分考生不熟悉的，但也不必紧张，因为答案中用了suppressant的动词形式suppress，另外一个关键词appetite与其同时出现，只是因词形有变化，所以词序随之改变。
