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
81
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.
"
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://kaotiyun.com/show/DU5K777K
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
Practicegetsarawdealinthefieldofappliedlinguistics.Mostlay-peoplesimplyassumesthatpracticeisanecessaryconditi
HomeschoolingappearstobeagreatIsuccessformiddle-classandwealthyfamilieswhenoneparentishomemostofthetime.Ho
Mr.Smithisbookingatourforaladyandhimselfatatravelagency.
America’smodernmusic:OneofAmerican’smostimportantexports:modemmusicThereasonsforitspopularity:its
Scientistareoftenaccusedofbeingpoorcommunicators,yettherearemanyreasonswhatscientists,inparticular,shouldbea
Eachsymbolinthistablehasavalue.Thetotalofthesevaluesineachrowandcolumniswrittenattheendofthecorrespondi
Itiscertainthatnofoodisasgoodas______earnedbyone’sownlabor,whetherphysicalormental.
ThesixteenthinternationalAIDSconferenceopenedonSundayinToronto,Canada.Morethantwenty-fourthousanddelegatesfromo
Chemistryisthestudyofthebehaviorandcompositionofmatter.Allfoodsaremadeupofchemicalsubstancewhichundergoesch
A、Attheendofthismonth.B、Yes,quiteoften.C、Sometimelastmonth.D、Onceamonth.D
随机试题
滚动轴承通常()固定不动。
曲线y=e2和直线y=1,x=1围成的图形面积等于()
关格证的概念包括
男性,66岁。1周来短暂意识障碍发作3次来诊,拟诊为阿一斯综合征。下列哪项心律失常最易引起此征
下列选用的起重钢丝绳安全系数中,正确的有()。
某工程项目施工合同规定钢材由发包人负责采购,根据施工合同示范文本的规定,这些钢材在使用前的检验应由( )。
《会员制证券投资咨询业务管理暂行规定》第十一条规定,通过媒体发表投资意见或建议,必须依据本公司最近( )个月内的书面研究报告,并能将相关研究报告及时提供给有需求的客户。
启发的方法在古代当以()的助产式谈话法最为典型。
习近平总书记指出:“中国梦是国家的、民族的,也是每一个中国人的;中国梦是我们的,更是你们青年一代的。”对这句话理解正确的是()
下列叙述中正确的是()。
最新回复
(
0
)