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![1.Howmanytimesdidyoubrushyourteethyesterday?·Finding：Af...]( "1.Howmanytimesdidyoubrushyourteethyesterday?·Finding：Af...")
1.Howmanytimesdidyoubrushyourteethyesterday?·Finding：Af...
问题详情：manytimesdidyoubrushyourteethyesterday?·Finding：Afull33%ofseniorsbrushtheirteethonlyonceaday.·Step：Removethe300typesofbacteriainyourmoutheachmorningwithabattery－operatedtoothbrush.Brushgentlyfo...
