首页
登录
职称英语
Scientists have devised a way to determine roughly where a person has lived
Scientists have devised a way to determine roughly where a person has lived
游客
2023-08-01
33
管理
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 rain 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 rain 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."
选项
A、One’s hair growth has to do with the amount of water they drink.
B、A person’s hair may reveal where they have lived.
C、Hair analysis accurately identifies criminal suspects.
D、The chemical composition of hair varies from person to person.
答案
B
解析
细节题。本题询问科学家有什么新发现。根据原文可知,科学家们发明了一种方法,用一缕头发来粗略确定一个人曾经在哪些地方生活过。故选B。
转载请注明原文地址:https://tihaiku.com/zcyy/2888533.html
相关试题推荐
Therearetwofactorswhichdetermineanindividual’sintelligence.Thefirs
【B1】[br]【B18】A、particularlyB、partiallyC、thoroughlyD、completelyB语义衔接题。keep/
Somepeoplebelievethatyouhavetobeaspecialkindofpersontosellap
[originaltext]M:WhoisthemostfamouspersoninThailand?W:TataYoung,Ith
[originaltext]M:WhoisthemostfamouspersoninThailand?W:TataYoung,Ith
Whatwasthejobofasoundeffectseditor?[br]Thesoundeffectspersonofrad
Scientiststhinkthemoralists’warningis______.[br]Whatthegovernmentcan
Culturaldifferencesinbusinessentertainingincludeissuessuchasperson
【B1】[br]【B9】[originaltext]RecentlyagroupofSwedishresearchscientists
【B1】[br]【B7】[originaltext]RecentlyagroupofSwedishresearchscientists
随机试题
Inthe1920sdemandforAmericanfarmproductsfell,asEuropeancountriesb
BasketballOrganizedbasketball【T1】______twoteamsoffiveplayerseach.
[originaltext]DemonstratorsfromalloverItalygatheredinaRomesquareSat
We【C1】______upacamerafortheveryfirsttime.Wesnapsomepictures.【C2
Whydoesthewomantellthemanthestory?[br][originaltext]W:Iseeyouare
LeviStrausswasborninGermany,and【C1】______toAmericawhenyoung.In185
组织建立和实施质量管理体系的方法步骤包括()。A.确定和提供实现质量目标必需
患者男性,50岁,因胆道感染入院保守治疗,治疗过程中突然出现神志淡漠,嗜睡,皮肤
张老师将多媒体技术与自己的学科教学紧密结合起来,编制的计算机辅助教学课件操作方便
某房地产开发公司购买一宗土地进行住宅开发,地价为1200万元,一次性付清。预计建
最新回复
(
0
)