分析 本文是一篇新闻报告,主要讲述了获得诺贝尔科学奖的五位美国科学家.他们分别是:获得诺贝尔生理学或医学奖的 Craig Mello--他发现可以用沉默致病基因治疗疾病;获得诺贝尔化学奖的Roger D.Kornberg--他研究了细胞是如何读取基因,以及他的父亲和获得诺贝尔物理学奖的George F.Smoot 和 John C.Mather--他们测量了天空中最古老的光,使科学家们确信大爆炸理论是正确的.
解答 48.D 词义猜测题.根据第二段In 2004,seven Americans were among the 10 laureates (获奖者) for the science prizes.Last year,the figure was five out of 10.可知美国科学家占了诺贝尔科学奖相当多的人数.故文章使用"swept横扫"一词,即各个奖项都有美国科学家获取了,故选D.
49.B 推理判断题.根据倒数第三段As the son of a Nobel Prize winning professor,Roger D.Kornberg (left) had a lot to live up to.But,nearly half a century after his father,won his award,可知作为诺贝尔奖获得者的儿子Roger D.Kornberg也不负众望,获得自己的奖项.说明Roger D.Kornberg的父亲也获得过诺贝尔奖,故选B.
50.B 推理判断题.根据本文介绍了有五位美国科学家获得诺贝尔科学奖.A"科学报告"、C"历史讲座"、D"广告"三项可排除.故本文应为一篇新闻报告,故选B.
点评 本文考察学生的理解推断能力,抓住文章的关键词,采用寻读的方法查找细节,能根据已知的结果推测导致结果的可能原因.
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