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
You can tell a lot about people by looking at their hair—and not just whether they brush, spray, or blow-dry. Scientists hav
You can tell a lot about people by looking at their hair—and not just whether they brush, spray, or blow-dry. Scientists hav
admin
2015-03-29
45
问题
You can tell a lot about people by looking at their hair—and 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 its parts—hydrogen and oxygen.
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(核素). And depending on where you live, tap water contains unique proportions of the heavier and lighter isotopes of hydrogen and oxygen.
Might hair record all this information? That’s what scientists wondered. To find out, researchers collected hair from barbers 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 did reflect 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 we drink 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. By combining that information with the results, they predicted the composition of hair in people from different regions.
The new technique can’t point to exactly where a person is from, because similar types of water appear in different regions that span(跨越)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.
Based on the finding, one research offers this advice:"
If you’re a criminal, shave.
"
In order to find out if hair can tell where a person is from, scientists need hair samples______.
选项
A、containing information on the composition of tap water
B、showing how much bottled water the person drinks daily
C、containing information on the kinds of food in the region
D、showing the variety of liquids the person regularly drinks
答案
A
解析
从第六段首句可以看出科学家们发现头发能够反映当地自来水中氢氧核素的浓度,由此推断要想知道一个人的居住地,当然需要头发的样本中包含自来水成分的信息。
转载请注明原文地址:https://kaotiyun.com/show/Gz5K777K
本试题收录于:
浙江省大学英语三级题库大学英语三级分类
0
浙江省大学英语三级
大学英语三级
相关试题推荐
Readingortheenjoymentofbookshasalwaysbeenregardedamongthecharmsofaculturedlifeandisrespectedandenviedbyth
Attheageof35,Nathan,awould-beprofessorinNewYorkState,shouldalreadyhaveapermanentpositionatauniversityandp
Whohasitandwhodoesn’t?Andhowdothoseofuswithlessofitgetmore?Itisariddlethathasexercisedphilosophersever
OneofLondon’smostbeautifulgardensisbeingtransformedintotheancientSilkRoadthiswintertocelebrateChineseNewYear
Theancientartofreadingsomeone’spalmhasalwaysbeen【C1】a______themostpopularwaysofforetellingthefuture.Afterall,
A、40B、160C、80D、20D题目问公司里有多少男性员工。对话中女土说,公司有80名女性员工,占了所有员工的80%,由此可知,男性员工有20名,占比20%。故选D。
Whenyouwriteassignments,youhavetodoresearch,whichmeansreadingwidely,using【D1】________sources,including,nowadays,
ParkingProblem;Forbiddenin【D1】______percentofstreetsReason:Buildingapartmentsand【D2】______ismoreprofitable,hencefew
Whenitcomestopersonalfinance,wearealllookingforwaystosavemoremoney.Ourhouseholdbudgetsarefilledwithbothbig
—CanIborrowyourbiketomorrow?—________.Iwon’tuseitanyhow.
随机试题
“人心不同,各如其面”,这句俗语为人格的独特性作了最好的诠释。
全面了解建设用地范围内各种地基的承载能力,对城市建设用地选择和各类工程建设项目的合理布置以及工程建设的经济性,都十分重要。()
如图16-7—1所示,集中力作用下的简支梁模型设计,σ1=σ2时,P2=100kN,则P1为()kN。
建设工程项目进度控制的管理观念方面存在的主要问题包括( )。
乙公司生产B产品,单位产品价格预计为200元,该产品单位产品变动成本为150元,应负担的固定成本总额为600000元,适用的消费税税率为6%。则B产品运用保本点定价法测算的应实现的销售量为()件。
与缴纳碳排放税相比,工业界更愿意参与碳汇交易。不仅在碳汇交易的规则制定上,工业界往往有较大的发言权,而且还可以通过投资或技术创新,减少支出,甚至通过交易盈利。因此在工业界的游说下,碳汇交易经常成为一项商业活动,其降低碳排放的本意往往被大大削弱。欧盟将于20
小明、小亮、小川、小海在网球场进行了几场球赛的较量。比赛结果是:①小明、小亮对阵小川、小海时,双方势均力敌,不相上下。②当小明与小川对调后,小明、小海一方轻而易举地获胜。③当小海腿受伤退出比赛后,小亮一个人同小明、小川两人同时较量,结果却取胜了。假
2013年1—7月份,某市规模以上工业增加值同比增长12.0%,增速比去年同期提高1.4个百分点。1—7月份,全市国有及国有控股企业完成增加值同比下降3.5%;民营企业完成增加值同比增长24.8%;外商控股企业完成增加值同比下降3.1%。三者增加
有黑、白棋子共300枚,按每堆3枚分成100堆,其中只有1枚白子的共27堆,有2枚或3枚黑子的共42堆,有3枚白子的与有3枚黑子的堆数相等,那么全部棋子中,白子共有多少枚?
"BuildingwithArches"RoundArchandVaultAlthoughtheroundarchwasusedbytheancientpeoplesofMesopotamiaseveral
最新回复
(
0
)