Scientists already knew how the composition of water varies throughout the country. Ehleringer and colleagues combined that information with their results to predict the composition of hair in people from different regions. One hair sample used in Ehleringers study came from a man who had recently moved from Beijing, China, to Salt Lake City. As his hair grew, it reflected his change in location.
The new technique cant 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.
36. What does the writer say about tap water? Which of the following is NOT correct?
A Tap water reflects the concentrations of hydrogen and oxygen isotopes in different regions.
B Tap water is a kind of soft drink in the United States.
C Tap water contains unique proportions of isotopes of hydrogen and oxygen.
D Tap water is used to cook food.
37. James R. Ehleringer tried to find out
A if our bodies break water down into its parts.
B if it is possible to collect hair samples across the country.
C if tap water contains unique proportions of isotopes of hydrogen and oxygen.
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