题目内容：
根据下列材料，请回答题：Foryearswehavebelievedwewereeitherhealthyorsick.51,duringthemid-90s,scientistsdevelopedanewconceptcalled“sub-health”,astatus52healthandillness.Theconceptofsub-healthhasbecome53becauseithashelpedtoexplainmanyhealthproblems.54onestudy,only5.6%ofpeopleintheoverallpopulationareactuallysick,55thesub-healthygroupconsistsofabout60%,andthe56populationisconsideredhealthy.57ofone’ssub-healthwillhelponetobealerttotheunderlyingdiseaseandremainhealthy.Sub-Healthisastateinwhichthebodyis58turningfromhealthtoillnessorfromillnesstohealth.Ourbodiesareactively59theconditionsofhealth,sub-healthanddisease.Factors60aging,internalorexternaltoxicity(毒性),andbodyormindexhaustionmaycausesub-health,buttakinggoodcareofthebodycanchangeasub-healthystatustoahealthyone. A．Besides
B．However
C．Meantime
D．Therefore
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