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2018年上海春季高考英语试卷附详解

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itisswallowedinverylargequantities.Itisforthereasonthatfluoridesupplementscanonlybeobtainedonprescriptionfromthedoctorordentist.Pleasebeassuredthatfluorideoverdosesarerare-infact,Ihaveneverheardofanyfatalincidentsrelatedtofluoridepoisoning.79.Scientificstudieshaveshownthatfluoridecanhelptopreventcavitiesaslongasitisusedcorrectly.Iffluorideisabused,thereisariskofillnessorevendeathsinextremecases.Ifadeadlyamountoffluorideistaken,immediatefirst-aidcouldsavealife.Apersonwhohasswallowedalargeamountoffluoridewillprobablystartvomiting.Ifnot,thepatientshouldbegivenmilkorantacidandtakentothenearesthospitalforemergencytreatment.80.Takingtoomuchfluoridewhileteetharegrowingcanleadtoaconditioncalleddentalfluorosis.Themostlikelycauseistheswallowingoffluoridetoothpastesbyyoungchildren.Itcanalsobecausedby

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