Similar patterns exist throughout the U.S. By measuring the proportion of heavier hydrogen and oxygen isotopes along a strand of hair, scientists can construct a geographic timeline. Each inch of hair corresponds to about two months.

    Cerling’s team collected tap water samples from 600 cities and constructed a map of the regional differences. They checked the accuracy of the map by testing 200 hair samples collected from 65 barber shops.

    They were able to accurately place the hair samples in broad regions roughly corresponding to the movement of rain systems.

    “It’s not good for pinpointing,” Cerling said. “It’s good for eliminating many possibilities.”

    Told Park, a local detective, said the method has helped him learn more about an unidentified woman whose skeleton was found near Great Salt Lake.

    The woman was 5 feet tall. Police recovered 26 bones, a T-shirt and several strands of hair.

    When Park heard about the research, he gave the hair samples to the researchers. Chemical testing showed that over the two years before her death, she moved about every two months.

    She stayed in the Northwest, although the test could not be more specific than somewhere between eastern Oregon and western Wyoming.

    “It’s still a substantial area,” Park said, “But it narrows it way down for me”.

62. What is the scientists’ new discovery?

 A) One’s hair growth has to do with the amount of water they drink.

B) A person’s hair may reveal where they have lived.

C) Hair analysis accurately identifies criminal suspects.

D) The chemical composition of hair varies from person to person.

63. What does the author mean by “You’re what you eat and drink” (Line 1, Para.3)?

 A) Food and drink affect one’s