VOA慢速英语 古足印让专家时光倒流

　　VOICE TWO:

　　Professor Harris says his team not only found footprints, but also many animal tracks in the rock. These include markings of hoofed animals that Homo erectus may have hunted for food. Other tracks belonged to meat-eaters. Such creatures were competitors or even threats to the early humans.

　　The footprints found in Kenya have let scientists step back in time to find new details about our distant ancestors and their environment.

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　　VOICE ONE:

　　An American study has shown that being hopeful about future events might help you stay healthy and live longer. The study found links between people's beliefs and their risks of cancer-related death, heart disease and early death.

　　Researchers studied one hundred thousand women during an eight-year period, beginning in nineteen ninety-four. All of the women were fifty years of age or older. The study was part of the Women's Health Initiative, a continuing study organized by the National Institutes of Health. The findings were presented earlier this month at a meeting of the American Psychosomatic Society.

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