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
2023-10-10
25
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] Why can’t the technique tell where exactly a person is from?
选项
A、Because many regions have similar types of water.
B、Because nowadays people drink too much bottled water.
C、Because scientists don’t know exactly how water varies.
D、Because there are too many different regions in the nation.
答案
A
解析
题干问的是该技术不能准确地判断一个人来自哪里的原因。倒数第二段首句明确指出——因为不同的地域存在相似的水,所以答案为A)。
转载请注明原文地址:https://tihaiku.com/zcyy/3087979.html
相关试题推荐
TheMondayeditionoftheUSATodaysaidsixtypeoplehavediedin84crashes
TheMondayeditionoftheUSATodaysaidsixtypeoplehavediedin84crashes
TheMondayeditionoftheUSATodaysaidsixtypeoplehavediedin84crashes
Manypeopleusuallythinkofdot-comcompaniesfirstwhentheythinkofITj
Manypeopleusuallythinkofdot-comcompaniesfirstwhentheythinkofITj
Manypeopleusuallythinkofdot-comcompaniesfirstwhentheythinkofITj
Thewatchtower,_____somanypeoplelosttheirlives,isnowatouristattract
Notuntilmostofthepeoplehadlefttheairport____hissisterwasthere.(SC
IftheUnitedStateshadbuiltmorehomesforpoorpeoplein1955,thehousingp
Importantpeopledon’toftenhavemuchfreetimebecausetheirwork____allthe
随机试题
TheAmericandefinitionofsuccessislargelyoneofacquiringwealthanda
以下关于智慧城市的理解中,恰当的是( )。A.智慧城市建设的关键是大量、有效地
A.预防控制体系 B.监测与预警系统 C.制定行政区域应急预案 D.全国突
A.既能开窍又能息风止痉B.既能开窍又能活血痛经C.既能开窍又能清热止痛D.既
①语言是符号体系,而每一种语言的符号体系都带着文化的烙印,都是这种语言的共同体集
如右图,OA、OB分别是小半圆的直径,且OA=OB=6厘米,角AOB为直
认知一结构学习论在教学中主张()。 A.探究法B.班级授课制C.发现法
甲某为A国国家总统,乙某为B国国家副总统,丙某为C国政府总理,丁某为D国外交部
下列单位中,属于建设工程监理行为主体的是()。A.工程建设单位 B.工程监理单
下列收入中,不属于一般性财政收入的是()A.政府债务收入 B.国有资产收
最新回复
(
0
)