【单选题】
HairDetectives
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. Our bodies break water down into its parts: hydrogen and oxygen.Atoms of these two elements end up in our tissues and hair.
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.And depending on where you live, tap water contains unique proportions of the heavier and lighter isotopes of hydrogen and oxygen.
Might hair record these watery quirks That’s what James R.Ehleringer, an environmental scientist at the University of Utah in Salt LakeCity, wondered to find out he and his colleagues collected hair from barbers and hair stylists 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 overwhelmingly reflected 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 people drink including milk and soft drinks 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.Ehlernger and colleagues combined that information with their results to predict the composition of hair in people from different regions. One hair sample used inEhleringer’s study came from a man who had recently moved fromBeijing,China, to Salt LakeCity.As his hair grew, it reflected his change in location.
The new technique can’t point to exactly where a person is from, because similar types of water appear in different regions that span 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.
What does the last paragraph tell youA．The new technique can tell precisely where a person lives.
B．Water supplied in different regions all come from the same source.
C．Types of water used in different regions provide useful information for the police.
D．Hair samples provide the most important clues to identify crimes.
网考网参考答案：C
网考网解析：
[解析] 选项A、B、D与原文均有出入。尽管在一个较大的范围内，人们使用成分较为相同的水，但是水的成分组成提供的信息可以帮助官方缩小破案线索范围。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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. Our bodies break water down into its parts: hydrogen and oxygen.Atoms of these two elements end up in our tissues and hair.
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.And depending on where you live, tap water contains unique proportions of the heavier and lighter isotopes of hydrogen and oxygen.
Might hair record these watery quirks That’s what James R.Ehleringer, an environmental scientist at the University of Utah in Salt LakeCity, wondered to find out he and his colleagues collected hair from barbers and hair stylists 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 overwhelmingly reflected 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 people drink including milk and soft drinks 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.Ehlernger and colleagues combined that information with their results to predict the composition of hair in people from different regions. One hair sample used inEhleringer’s study came from a man who had recently moved fromBeijing,China, to Salt LakeCity.As his hair grew, it reflected his change in location.
The new technique can’t point to exactly where a person is from, because similar types of water appear in different regions that span 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.
What does the last paragraph tell youA．The new technique can tell precisely where a person lives.
B．Water supplied in different regions all come from the same source.
C．Types of water used in different regions provide useful information for the police.
D．Hair samples provide the most important clues to identify crimes.
网考网参考答案：C
网考网解析：
[解析] 选项A、B、D与原文均有出入。尽管在一个较大的范围内，人们使用成分较为相同的水，但是水的成分组成提供的信息可以帮助官方缩小破案线索范围。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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