Imagine a person who is about the right weight, but does not eat very nutritious (有营养的) foods, who feels OK but exercises only occasionally, who goes to work every day, but is not an outstanding worker, who drinks a few beers at home most nights but does not drive while drunk, and who has no chest pains or abnormal blood counts, but sleeps a lot and often feels tired.(06.12 Passage 2)
主干：Imagine a person...
主干部分很简短，关键是a person后面有5个who引导的定语从句，使句式变得复杂了。这5个who引导的从句都有相似的结构：含两个由but 连接的谓语，前后的描述形成鲜明的对比。这样的排比句式，加强了语气，给读者留下深刻印象。
译文：想象这么一个人：他体重适中，但是并没有吃到非常有营养的食物;他自我感觉还行，但只是偶尔锻炼一下;他每天都去上班，但却不是一个优秀员工;他大多数晚上在家里喝一点啤酒，但却并不醉酒驾车;他没有胸痛的感觉，血液指数也正常，但却嗜睡，并且经常感到疲倦。
