参考答案

正确答案：B
解析：这是一道细节题。对于题干中出现的以大写字母表示的医学物质NNK，考生大可视之为代号，无需钻研其含义。带着关键词NNK回文章中寻找相关内容。第二段第四行中说，“NNK is known to be involved in inducing lung cancer in both lab rats and smokers．”(试验用老鼠以及吸烟者都曾因NNK而引发肺癌。)induce sth．意即bring sth．about；cause。可以说"illness induced by overwork(32作过度引起的疾病)”。所以，本题题目意即"which disease will be induced by NNK?'’根据原文，会引发肺癌，故选B。