Topic21：谈论现在人寿命长的原因？
Topic21 In general, people are living longer now. Discuss the causes of this phenomenon. Use specific reasons and details to develop your essay.
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Topic: 21
With the development of human society, people are living longer now. Many factors interacting together to enable the longer life. There are three most important causes: the quality of food has been greatly improved; people could have medical ser
