第30题: [单项选择]According to the American federal government, residents of Hawaii have the longest life________. A. scope B. rank C. span D. scale 参考答案:C 答案解析:本题考查名词辨析。life span“寿命”,固定搭配。scope“(活动)范围,机会,余地”; rank“等级,横列,阶级”;scale“刻度,衡量”。句意为:根据美国联邦政府的调查,夏威夷居民寿命