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
专升本
Scientists have devised a way to determine roughly where a person has lived using a strand(缕)of hair, a technique that could hel
Scientists have devised a way to determine roughly where a person has lived using a strand(缕)of hair, a technique that could hel
admin
2016-03-05
21
问题
Scientists have devised a way to determine roughly where a person has lived using a strand(缕)of hair, a technique that could help track the movements of criminal suspects or unidentified murder victims.
The method relies on measuring how chemical variations in drinking water show up in people’s hair.
" You’re what you eat and drink, and that’s recorded in your hair," said Thure Cerling, a geologist at the University of Utah.
While U. S diet is relatively identical, water supplies vary. The differences result from weather patterns. The chemical composition of rainfall changes slightly as rain clouds move.
Most hydrogen and oxygen atoms in water are stable, but traces of both elements are also present as heavier isotopes(同位素). The heaviest raid falls first. As a result, storms that form over the Pacific deliver heavier water to California than to Utah.
Similar patterns exist throughout the U. S. . By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline. Each inch of hair corresponds to about two months.
Cerling’s team collected tap water samples from 600 cities and constructed a map of the regional differences. They checked the accuracy of the map by testing 200 hair samples collected from 65 barber shops.
They were able to accurately place the hair samples in broad regions roughly corresponding to the movement of raid systems.
"It’s not good for pinpointing(精确定位)," Cerling said. "It’s good for eliminating many possibilities. "
Todd Park, a local detective, said the method has helped him learn more about an unidentified woman whose skeleton was found near Great Salt Lake.
The woman was 5 feet tall. Police recovered 26 bones, a T-shirt and several strands of hair.
When Park heard about the research, he gave the hair samples to the researchers. Chemical testing showed that over the two years before her death, she moved about every two months.
She stayed in the Northwest, although the test could not be more specific than somewhere between eastern Oregon and western Wyoming.
"It’s still a substantial area," Park said "But it narrows it way down for me. "
What did Cerling’s team produce in their research?
选项
A、A map showing the regional differences of tap water.
B、A collection of hair samples from various barber shops.
C、A method to measure the amount of water in human hair.
D、A chart illustrating the movement of the rain system.
答案
A
解析
答案为第七段第一句的同义表达。
转载请注明原文地址:https://kaotiyun.com/show/GDHC777K
本试题收录于:
英语题库普高专升本分类
0
英语
普高专升本
相关试题推荐
CarolsaidtheworkwouldbedonebyOctober,_____personallyIdoubtverymuch.
Henrywasn’tpaidbecausehewasthe_____secretaryoftheassociation.
Agoodteacheralwaystriesto______studentstoaskquestion.
InthisparyouarerequiredtowriteacompositionentitledTalentShowsonTVinnolessthan100wordsaccordingtothefollo
Therearetwofactorswhichdetermineanindividual’sintelligence.Thefirstisthesortofbrainheisbornwith.Humanbrain
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshewears,thefoodheeatsandthefriendswithwhom
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshewears,thefoodheeatsandthefriendswithwhom
Aperson’shomeisasmuchareflectionofhispersonalityastheclotheshewears,thefoodheeatsandthefriendswithwhom
A:Hi,mynameisJane.B:Hi,Jane.I’mConnie.Nicetomeetyou.Areyouanewstudenthere?A:Yeah.Urn,【D1】______B:Sure.
Areporterfromalocalnewspaperisinterviewingsomestudentsonthesubjectof"studentsandmoney".Reporter:【D1】______St
随机试题
PresidentBarackObamaclaimedprogressWednesdayinhissecond-termdrivetocombatclimatechangebutsaidmoremustbedonet
不属于万全“育婴四法”内容的一项是()
A.阿司匹林与抗凝血药合用B.辛伐他汀与环孢菌素合用C.丙磺舒与青霉素合用D.碳酸氢钠与氢化可的松合用E.含有钙、镁、铝等离子的抗酸药与四环素合用影响药物代谢的合用为
项目利益相关者一般通过________联系在一起的。
对一个测验使用者来说()。
某企业采取欺骗的手段与某劳动者订立了劳动合同,根据劳动法,该合同为无效劳动合同。劳动合同的无效,由()确认。
新修订的《中华人民共和国未成年人保护法》自2007年6月1日起施行。我国未成年人保护主要包括家庭保护、学校保护、社会保护和司法保护。制定《中华人民共和国未成年人保护法》的主要目的是()。
下列不属于民事诉讼法中表述的诉讼参与人的是()。
Time,asweknowit,isaveryrecentinvention.Themoderntime-senseishardlyolderthantheUnitedStates.Itisaby-produ
CollegeLifeAmericancollegeanduniversitystudentswho【T1】______________awayfromtheirfamiliesaregenerallyhoused
最新回复
(
0
)