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whAt is this tAlk mAinly ABout A、thE importAnCE oF prEvEntivE ACtions AgAinst mEDiCAl risksB、AmEriCAns’ misunDErstAnDing oF prEvEntivE ACtions AgAinst mEDiCAl risks.C、thE rEAsons why somEAmEriCAns FAil to rEACt AgAinst somE mEDiCAl risks.D、An invEstigAtion ABoutAmEriCAns’ AttituDEs towArD mEDiCAl risks AnD somE suggEstions.