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
55
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://kaotiyun.com/show/I9Qd777K
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
PlantGasScientistshavebeenstudyingnaturalsourcesofmethanefordecadesbuthadn’tregardedplantsasaproducer,not
AborntobemoreintelligentorlessintelligentBhaveabetterchancetodevelophisintelligenceCtaughttobemoreintelli
AborntobemoreintelligentorlessintelligentBhaveabetterchancetodevelophisintelligenceCtaughttobemoreintelli
ActiveinOldAgeKeepsPeopleMobilePeopleover70whoaren’tactivearemorelikelytodevelopproblemswalkingorclimbi
Antibioticresistancedoesn’tjustmakepathogens(病原体)difficulttotreat,ItalsomakesthemhardertotrackTraditionally,epi
Mothersandmatchmakers(媒人)havealwaysknownthatnotbeingmarriedisadefinitehealthhazard.Butwhenateamofresearchers
1.Medicineisthescienceandartofhealing.Itisasciencebecauseitisbasedonknowledgegainedthroughcarefulstudyand
TheIcemanOnaSeptemberdayin1991,twoGermanswereclimbingthemountainsbetweenAustriaandItaly.Highuponamount
Itislaiddownintheregulationsthatallmembersmustcarrytheirmembershipcardsatalltimes.
TheIcemanOnaSeptemberdayin1991,twoGermanswereclimbingthemountainsbetweenAustriaandItaly.Highuponamount
随机试题
3~5岁小儿,反复上呼吸道感染的诊断标准是,每年发生上呼吸道感染
易致术中剧痛的麻醉方法是
某开发商所开发的物业质量与市场领导者的物业质量相近,如果定价比市场领导者的定价低,则其采用的是()。
下列资产中,不能界定为国有资产的是()。
甲公司持有乙上市公司20%的股份表决权,丙公司持有乙上市公司15%的股份表决权,丙公司是甲公司的子公司。所以,甲公司获得对乙公司的实际控制权。()
经营出境旅游业务的国际旅行社,需缴纳______万元人民币的质量保证金。经营入境旅游业务的国际旅行社,需缴纳______万元人民币的质量保证金。经营国内旅游业务的国内旅行社,需缴纳______万元人民币的质量保证金。
给婴儿开始添加辅食的合适时间是()。
学生教学管理系统、图书管理系统都是以【】为基础和核心的计算机应用系统。
Itisamazingthatsomanypeople___________________(愿为社区的利益做义务工作).
A、Watchherpartner.B、Playhercardsincooperationwithherpartner.C、Quitthegame.D、Teachthemanhowtoplaybridge.A女士说
最新回复
(
0
)