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The Olympic torch starts its journey around the world from the opening ceremony of Olympic Games.

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目前老龄化现象很严重 2. 这种现象可能产生的社会影响和后果 3. 你的建议 On Aging Population
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According to Cynthia Kenyon, anti-aging drugs in the future will ______.
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D．be taken to study their side effects
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