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
外语
You can tell a lot about people by looking at their hair—and not just whether they brush, spray, or blow-dry. Scientists hav
You can tell a lot about people by looking at their hair—and not just whether they brush, spray, or blow-dry. Scientists hav
admin
2016-06-02
43
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.
"
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://kaotiyun.com/show/PU5K777K
本试题收录于:
浙江省大学英语三级题库大学英语三级分类
0
浙江省大学英语三级
大学英语三级
相关试题推荐
Maryhas_________onthefamilytraditionofgivingawayplants.
ItisveryimportantforstudentswhoarestudyingEnglishasasecondlanguagetoreadsimpleEnglish.Somestudentsmaynotlik
A、Heshouldn’ttrytofinisheverythingtonight.B、Heshouldhaveenoughsleepeveryday.C、Heshouldn’tleaveinthemorning.D
Scientistareoftenaccusedofbeingpoorcommunicators,yettherearemanyreasonswhatscientists,inparticular,shouldbea
Harryfirstbecameinterestedinadventuretravelbecausehisfather________.
A、Reduceviolationsofintellectualpropertyrights.B、Controlthegrowingpopulation.C、Workingtogethertofightterrorism.B
A、Loseweight.B、Quitsmoking.C、Weighhimselffrequently.D、Haveatalkwiththedoctor.A推断题。男士说:医生说如果我继续吸烟会增加得心脏病的可能性。女士问了一句
RecentlywehadsomereportsaboutconcernsovertheprogressofboysintheAmericaneducationsystem.Somepeoplesaythereis
Inmanycountriesthereisafixedchargeforpersonalservices.Acertainpercentagemaybeaddedtothebillatahotelorres
Sittinginstationarytrafficis,atbest,aZenexperience.Driversmiredinajamlearntocedecontroltothepowersthatbe,
随机试题
下列哪项不可提起行政复议?()
A、Whenshegetsthebooks.B、Whenshehandsintheform.C、Whentheclassesbegin.D、Whensheisabletopay.A女士问男士何时付款,男士说在取书的
《诗经·氓》:总角之宴,__________。
妊娠合并心脏病产后结扎的适宜时间是
社会因素影响健康的途径有
(妊娠期妇女用药注意事项)A.胰岛素B.氮芥类C.维生素DD.青霉素类E.噻嗪类妊娠期妇女使用可引起死胎,胎儿电解质紊乱,血小板减少症的药品是
依据《土地管理法》和《建设用地审查报批管理办法》,集体土地征收的程序正确的步骤是()。
注册会计师正在拟定对景宏公司存货的监盘计划,由助理人员实施监盘工作,下面有关监盘计划和监盘工作有无不妥当之处?若有,请予以更正。(1)注册会计师在制定监盘计划时,应与景宏公司沟通,确定检查的重点。(2)由于盘点日正值产销旺季,与景宏公司沟通后,决定在盘
教学过程的性质。
A、OnFriday.B、OnSaturday.C、OnThursday.D、OnWednesday.A消息中:Thepresident,facingimpeachmentoverallegationsofcorruption
最新回复
(
0
)