首页
外语
计算机
考研
公务员
职业资格
财经
工程
司法
医学
专升本
自考
实用职业技能
登录
外语
Hair Detectives Scientists have found a way to use hair to figure out where a person is from and where that person has been.
Hair Detectives Scientists have found a way to use hair to figure out where a person is from and where that person has been.
admin
2011-01-05
42
问题
Hair Detectives
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. Our bodies break water down into its parts: hydrogen(氢)and oxygen. Atoms (原子) of these two elements end up in our tissues and hair.
But not all water is the same. Hydrogen and oxygen atoms can vary in how much they weigh. Different forms of a single element are called isotopes(同位素). And depending on where you live, tap water contains unique proportions of the heavier and lighter isotopes of hydrogen and oxygen.
Might hair record these watery quirks(古怪举动;怪僻). That’s what James R. Ehleringer, an environmental scientist at the University of Utah in Salt Lake City, wondered.
To find out, he and his colleagues collected hair from barbers and hair stylists(发型师)in 65 cities in 18 states across the United States. The researchers assumed that the hair they collected came from people who lived in the area.
Even though people drink a lot of bottled water these days, the scientists found that hair overwhelmingly(压倒性地) reflected the concentrations of hydrogen and oxygen isotopes in local tap water. That’s probably because people usually cook their food in the local water. What’s more, most of the other liquids people drink including milk and soft drinks contain large amounts of water that also come from sources within their region.
Scientists already knew how the composition of water varies throughout the country. Ehleringer and colleagues combined that information with their results to predict the composition of hair in people from different regions. One hair sample used in Ehleringer’s study came from a man who had recently moved from Beijing, China, to Salt Lake City. As his hair grew, it reflected his change in location.
The new technique can’t point to exactly where a person is from, because similar types of water appear in different regions that span a broad area. But authorities can now use the information to analyze hair samples from criminals or crime victims and narrow their search for clues(线索).
What does the writer say about tap water? Which of the following is NOT correct?
选项
A、Tap water reflects the concentrations of hydrogen and oxygen isotopes in different regions.
B、Tap water is a kind of soft drink in the United States.
C、Tap water contains unique proportions of isotopes of hydrogen and oxygen.
D、Tap water is used to cook food.
答案
B
解析
短文第六段提到“尽管现在人们喝了大量瓶装水,但是科学家发现,头发绝大多数反映的还是氢,氧同位素在当地自来水中的含量。这可能是因为人们通常用当地水做饭。此外,人们饮用的其他液体,包括奶和软饮料,都含有大量的来自本地区的水”,故选B。
转载请注明原文地址:https://jikaoti.com/ti/kH6sFFFM
本试题收录于:
职称英语理工类C级题库职称英语分类
0
职称英语理工类C级
职称英语
相关试题推荐
15Iexpectthatshewillbeabletocaterforyourparticularneeds.
AHealthProfileAhealthprofileisaportraitofallofthefactorsthatinfluenceyourhealth.Todrawyourhealthprofil
AborntobemoreintelligentorlessintelligentBhaveabetterchancetodevelophisintelligenceCtaughttobemoreintelli
AwithoutpityBsadandlonelyCemotionallyhealthyDwithoutrealloveforthemEasenseofsecurityFalonelywolfIfyou
FemaleBullfightingItwasaunique,eye-catchingsight:anattractive,womaninashinybullfighter’ssuit,swordinhand,
Becauseheadachesareapartofalmostallofourlives,peoplewithchronicheadachessometimesdon’trealizethattheymaynee
Kanwasabductedbecausehewastheonlywitness.
Antibioticresistancedoesn’tjustmakepathogens(病原体)difficulttotreat,ItalsomakesthemhardertotrackTraditionally,epi
TheIcemanOnaSeptemberdayin1991,twoGermanswereclimbingthemountainsbetweenAustriaandItaly.Highuponamount
GeologyandHealthTheimportanceofparticularmetalsinthehumandiethasbeenrealisedwithinthepastfewdecades,and
随机试题
下列作品中,用“以小见大”的手法反映社会现实的是()
血吸虫病黄淮地区流行的疟疾
肝经郁火所致妇科病不常见于
个人教育贷款的还款来源主要是()。
风险调整中,通过()来不断完善整个风险管理系统,以获得最佳成本效益。
第七次咨询:心理咨询师:经过前几次的咨询,我们基本达到了预定的咨询目标,您的情绪、行为有了很大改变,我为您感到高兴。求助者:谢谢您!心理咨询师:接下来我们将要一起进行咨询效果评估,大概包括六个方面的内容。求助者:正是
《国家中长期教育改革和发展规划纲要(2010-2020年)》指出教育工作的根本要求是()。
甲、乙双方连续几年订有买卖“交流电机”的合同。有一次签订合同时,在“标的物”一栏只写了“电机”两字。当时正值交流电机热销,而甲方供不应求,故甲方就以直流电机交货。就民法的基本原则而言,甲方违反了()。
简述我国刑法关于追诉期限的规定
设A是n×m矩阵,B是m×n矩阵,E是n阶单位矩阵.若AB=E,证明:B的列向量组线性无关.
最新回复
(
0
)