首页
登录
职称英语
You can tell a lot about people by looking at their hair—and not just whethe
You can tell a lot about people by looking at their hair—and not just whethe
游客
2023-10-11
35
管理
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.
" [br] Water is different in that______.
选项
A、hydrogen and oxygen atoms are broken down differently by people
B、different samples contain different proportions of isotopes of hydrogen
C、the weight of hydrogen and oxygen atoms varies from sample to sample
D、its proportion in an adult human’s body weight is different across people
答案
C
解析
题干中的different与第四段中的not…same对应,由此定位至第四段。该段首先指出不是所有的水都是相同的,接着指出氢氧核素因其重量的不同也有差异,各地自来水中氢氧核素成分的比重也因此存在差异,由此推断水的差异性在于氢氧核素成分的比重。
转载请注明原文地址:https://tihaiku.com/zcyy/3089101.html
相关试题推荐
Interviewer:Mostpeoplelovethecircus.Areyoureadyfortomorrowafternoon’s
Moreandmorepeoplearebecomingawareofthedangersfacingourplanet.______
Researchershavesuspectedthatlargeportionsencouragepeopletoeatmore,but
Theissuein______iswhetherCongressshouldpreserveaconceptcalled"netne
Peoplecarryoutmuchoftheircommercehere,______sellingvegetables,serving
Formostpeople,keepingfitinvolvesanestablishedexerciseroutinebuilta
Formostpeople,keepingfitinvolvesanestablishedexerciseroutinebuilta
Formostpeople,keepingfitinvolvesanestablishedexerciseroutinebuilta
Formostpeople,keepingfitinvolvesanestablishedexerciseroutinebuilta
Formostpeople,keepingfitinvolvesanestablishedexerciseroutinebuilta
随机试题
[originaltext]W:Haveyoumanagedtoassemblethemachineyet?M:I’vebeenstudy
[originaltext]W:SothisistheInternet?M:Well,it’stheWorldWideWeb,whi
TheCrowBlackfoot,andSiouxtribes(traditionally)adorned(they)dwellingsan
期货交易者根据进入期货市场的目的不同,可分为()。A、套期保值者B、投机者C、个人D、会员A,B期货交易者根据进入期货市场的目的不同,可分为套期
解决问题的基本过程是( )。A.发现问题——理解问题——提出假设——检验假设
黄老师组织幼儿全班幼儿参观小学后,请每位幼儿将自己参观小学的感受、体会或愿望用图
以下哪些可以作为相对估值法的指标()。 Ⅰ.市盈率 Ⅱ.市净率 Ⅲ.
对表证较轻,喘咳较重的患者首选A:炙麻黄B:生麻黄C:麻黄绒D:蜜炙麻黄绒
作为主体的我对自己以及自己与周围事物的关系的意识称为()。
农产品具有的需求的特殊性包括()。A.农产品需求具有派生性 B.农产品需求价
最新回复
(
0
)