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im sohan ae re-thelimit Therebe of this trend reversing.If the cowith bringing up chil-drenheeprent cou fcea bill of overnteyears'me"35.WhA.ed to28.Accordingeethe s ofachild last year wasA.￡63,738B.￡140,45829.The biggest increase cost is in the area ofC.￡218,458D.￡350,000C.smyA.food第二节B.childcarenily30.How is the text mainly developed?C.clothingD.education根：mA.By figures.InimB.By examples.31.What's the best title for the text?C.By inference.D.By comparison.This pA.How to educate a child properlyderstanB.Cutting the benefits of child welfareprocessC.The cost of raising a child has hit an all time high■D.Which is more important,education or childcare?self-reflectingDThere're some consumer products where every year brings new versions.Computers get fas-■ter and cellphones get lighter.It's easy to imagine why inventors are drawn to redesigning thesefeels reproducts-the technology for making them is changing all the time.or somBut what about consumer products that have been around for a long time?According to a■website,there were 138 patents with the word toothbrush in 2021.I talked with several of thoseThroupatent holders about why they invented their toothbrushes.They all said pretty much the samefor thething:Something was missing in the toothbrush universe.to hav"Cleaning the teeth is actually a pretty complex problem,and I think that's probably whythere's been so much invention around it,"says Tom Mintel.He's not at all surprised there weregoalsso many toothbrush patents in 2021.Brushing isn't like floor polishing.There're areas in thea monmouth in need of cleaning that have different shapes and funny angles.Teeth are hard,but gums)are soft,so you can't brush both with the same force.SelA.AsMichael Davidson,a dentist,says most new toothbrushes are designed for their looks,withfancy handles or different-colored bristles().The most effective technique,says Davidson,B.Threquires holding the brush so the bristles are titled()at approximately a 45-degree angleC.Pradown toward the gums."So one day I just sat down and said,If I were going to design a reallyD.It'good toothbrush,how would I do it?'"E.FinInstead of trying to teach people to tilt their hands to the right angle as they held the brush,F.Selhe would tilt the bristles to the correct angle.That way allthebforth.“It was idiotproof,”he says