attacks and strokes，and greater mental sharpness.They also tended to be more socially active and have more friends and family to rely on.But even with those factors accounted for，green tea itself was tied to a tower disability risk，the researchers said.

　　People who drank at least five cups a day were one­third less likely to develop disabilities than those who had less than a cup per day.Those people who averaged three or four cups a day had a 25 percent lower risk.

　　Although it’s not clear how green tea might offer a buffer (缓冲) against disabilities，lead researcher Yasutake Tomata did note that one recent study found green tea extracts (提取物) seem to increase leg muscle strength in older women.

　　While green tea and its extracts are considered safe in small amounts，they do contain caffeine and small amounts of vitamin K，which means it could affect drugs that prevent blood clotting (凝固)．6．What does the underlined word “peers” mean in the first paragraph?

　　A．Fathers.

　　B．Brothers.

　　C．People of the same age.

　　D．People living in the same neighborhood.

　　7．What can be learned from the passage?

　　A．Antioxidant chemicals can lead to disease.

　　B．Those who often drink green tea can’t develop “functional disability”． C．“Functional disability” is related to problems with daily activities or basic needs.

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