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
2024-08-03
3
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/3703719.html
相关试题推荐
Practicegetsarawdealinthefieldofappliedlinguistics.Mostlay-peoplesim
Practicegetsarawdealinthefieldofappliedlinguistics.Mostlay-peoplesim
Practicegetsarawdealinthefieldofappliedlinguistics.Mostlay-peoplesim
________2.6millionpeoplestartingdietsonNewYear’sDay,thereportsaystha
Peoplehavebeenpaintingpicturesforatleast30,000years.Theearlies
Peoplehavebeenpaintingpicturesforatleast30,000years.Theearlies
Peoplehavebeenpaintingpicturesforatleast30,000years.Theearlies
Peoplehavebeenpaintingpicturesforatleast30,000years.Theearlies
Peoplehavebeenpaintingpicturesforatleast30,000years.Theearlies
Musicmeansdifferentthingstodifferentpeopleandsometimesevendifferentth
随机试题
Inoursystemofeducationtoday,examinationsareacommonfeature.Ourprese
设两个相互独立的事件A和B都不发生的概率为,A发生,B不发生的概率与B发生A不发
电子计算机的主要特点是()。A.速度快、储存量大、体积小 B.速度快、价格低、
"动极者镇之以静,阴亢者胜之以阳",说明阴阳之间的关系是A.交感互藏 B.互根
下列各项中,不体现“谨慎性”会计信息质量要求的是: A.计提资产减值准备 B
CRI最常见的病因是A、肾结核 B、肾小动脉硬化症 C、慢性肾盂肾炎 D、
患者女性,18岁,昨晚9时突发双眼上吊,牙关紧闭,口吐白沫,双上肢屈曲,双拳紧握
早期低钙血症,发生的时间为生后A、36小时内 B、48小时内 C、72小时内
户籍在甲市,但却在丁市连续就医两年的林某,起诉其分别居住在乙市的儿子大林和丙市的
为了保证债务的履行,确保债权的实现,在债务人的信用或特定的财产之上设定的特殊的民
最新回复
(
0
)