题目内容
6.You can tell a lot about people by looking at their hair-not just whether they brush,spray or blow-dry.Scientists have found a way to use hair to figure out where a person is from and where that person has been.The finding could help solve crimes,among other useful applications.Water is central to the new technique.The liquid makes up more than half an adult human's body weight.Our bodies break water down into hydrogen(氢) and oxygen.Atoms of these two elements end up in our tissues,fingernails,and hair.
But not all water is the same.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.Each type is called a hydrogen isotope(同位素).And depending on where you live,tap water contains different isotopes.
Can hair record this information?That's what James R.Ehleringer,an environmental chemist at the University of Utah,wondered.To find it out,he and his colleagues collected hair from hair stylists in 65cities across the United States.Even though people drink a lot of bottled water these days,the researchers have found that people's hair has the same isotopes as found in local tap water.That's probably because people usually cook their food with the local water.
Authorities can now use the information to analyze hair samples from criminals or crime victims and narrow their search for clues.For example,one hair sample used in Ehleringer's study came from a man who had moved from San Francisco to Salt Lake City.As his hair grew,it reflected his change in location.
28.What do we know about the hydrogen isotopes according to Paragraph 3?B
A.They are classified by size.
B.Each type of them differs in weight.
C.They can improve the quality of tap water.
D.Some of them cannot combine with oxygen.
29.Why is it possible to know where people are from by analyzing their hair?D
A.People use the same bottled water.
B.People wash their hair in different ways.
C.People's hair is affected by the weather of the places they stay.
D.People'hair indicates the type of water in the places they stay.
30.The last paragraph is mainly to showC.
A.how to recognize criminals
B.how to collect hair samples
C.the usefulness of hair analysis
D.the process of Ehleringer's study
31.Which of the following can be the best title for the passage?C
A.Water composition B.Change your hair C.Hair detectives D.No way out.
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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