听力原文：Exercise appears to be most effective in reducing risk of death from heart disease or respiratory problems, but it also has an effect on other health conditions. The more exercise, the better, but even moderate exercise lowers death risk.

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• 听力原文：Professor Lawrence is going to retire, but she is still going to lead a graduate seminar each semester.

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• 听力原文：Sudanese opposition leader Sadeqal-Mahdi, who travels to Washington next week, sa

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• 听力原文：A newspaper reports Saudi Arabia’s Crown Prince Abdullah has canceled a visit to

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• 听力原文：W: Welcome to our program. Today Prof. Johnson is going to talking about solar power.

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