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Heart disease is a main cause of death in developing countries.
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This passage tells us the causes and harm of high cholesterol and how to lower it.
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1. 给你的朋友Frank发一封e-mail,告诉他由于明天你要参加一场考试,无法按预定计划和他见面;2. 对此带来的不便表示抱歉;3. 重新约定见面时间。Changing the Time of an Appointment
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