The important factors for longevity are______. A.suitable living areas B.independence and freedom to do things C.a placid state of mind and expectation of longevity D.all of the above
A.A.suitable B.independence C.a D.all
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D 解析：本题是一道结论类问题。问长寿的重要因素是什么。根据文章全文内容，我们可以得出结论，人若想长寿，需有适宜......