分析 短文主要讲了科学研究发现,通过研究头发可知你来自何方.
解答 28.B.细节理解题.根据第三段中的Hydrogen and oxygen atoms can vary in how much they weigh.In the case of hydrogen,for example,there are three types according to their weights 可知氢同位素每一种类的重量不同,因此选 B 项.
29.D.细节理解题.根据第四段中的the researchers have found that people's hair has the same isotopes as found in the local tap water可知,头发中的同位素与当地自来水的同位素一样,由此来推断这个人是否来自当地.
30.C.推理判断题.根据最后一段中的narrow their search for clues可知,该段说明了分析头发的用处,故答案为C.
31.C.主旨大意题,短文主要讲了科学研究发现,通过研究头发可知你来自何方,因此是对头发的侦查,故答案为C.
点评 解答任务型阅读理解题,首先对原文材料迅速浏览,掌握全文的主旨大意.因为阅读理解题一般没有标题,所以,速读全文,抓住中心主旨很有必要,在速读的过程中,应尽可能多地捕获信息材料.其次,细读题材,各个击破.掌握全文的大意之后,细细阅读每篇材料后的问题,弄清每题要求后,带着问题,再回到原文中去寻找、捕获有关信息.最后,要善于抓住每段的主题句,阅读时,要有较强的针对性.对于捕获到的信息,要做认真分析,仔细推敲,理解透彻,只有这样,针对题目要求,才能做到稳、准.
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