![I’musuallyfairlydoubtfulaboutanyresearchthatconcludesth...]( "I’musuallyfairlydoubtfulaboutanyresearchthatconcludesth...")
- 问题详情：I’musuallyfairlydoubtfulaboutanyresearchthatconcludesthatpeopleareeitherhappierorunhappierormoreorlesscertainofthemselvesthantheywere50yearsago．Whileanyofthesestatementsmightbetrue，theyarepracticallyimpossibletoprovescientifically．Still，Iwasstru...
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