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
2024-08-02
40
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] This new technique might help with______.
选项
A、tracking down lost animals
B、the prevention of water pollution
C、identifying criminals without hair
D、the identification of crime victims
答案
D
解析
倒数第二段末句指出有关当局可以利用这些信息分析罪犯或者受害者的头发样本,以缩小其搜索范围来准确寻找线索,由此可知此技术可以帮助辨认犯罪受害者。
转载请注明原文地址:https://tihaiku.com/zcyy/3702598.html
相关试题推荐
Mostpeoplemanagetoreturnfromtheirholidayswithacoupleofamusinganecdo
Mostpeoplemanagetoreturnfromtheirholidayswithacoupleofamusinganecdo
Mostpeoplemanagetoreturnfromtheirholidayswithacoupleofamusinganecdo
Mostpeoplemanagetoreturnfromtheirholidayswithacoupleofamusinganecdo
Mostpeoplemanagetoreturnfromtheirholidayswithacoupleofamusinganecdo
What’sthemainmessageofthenewsitem?[originaltext]"Oneintenyoungpeople
Jenniethinksthatpeopledidn’thaveahealthierdietahundredyearsago.[br]
Jenniethinksthatpeopledidn’thaveahealthierdietahundredyearsago.[br]
Jenniethinksthatpeopledidn’thaveahealthierdietahundredyearsago.[br]
Jenniethinksthatpeopledidn’thaveahealthierdietahundredyearsago.[ori
随机试题
[img]2022m5s/ct_ve01501001z0004_epelist_0240_220430[/img][br][originaltext]My
CampingFirst,theequipment.【1】______andsleeping-bag
Books,eveninthisageofcheapliterature,costmoney.Theshortofpa-
[originaltext]Moderator:Hello,ladiesandgentlemen.Itgivesmegreat
数字出版产品策划工作的中心环节是( )。A.信息采集与数据分析 B.制订策划
道路上的井室必须使用()装配稳固。A.重型井盖 B.轻型井盖 C.普通井盖
A.银翘散 B.麻黄汤 C.麻杏石甘汤 D.射干麻黄汤 E.五苓散肾病综
{}原则是一条具有中国传统文化特色的教学原则,它要求教师应认真了解和研究
在被疑为狂犬病的小狗咬伤后,下列处理错误的是A.挤出污血,尽快用肥皂水反复冲洗至
朱某生前曾与他的邻居签订了遗赠扶养协议,他的邻居尽了扶养义务,朱某还在他去世前1
最新回复
(
0
)