英语阅读理解,具体看下面,如何做英语阅读理解Areyouhappywithyourteeth?Inthelastfiveyears,teethwhiteninghasbecomeverypopularamongyoungAmericans.Nowthetrend(潮流)hascometoChina.IfyouturnontheTVyoucansee

　　英语阅读理解,具体看下面,如何做英语阅读理解

　　Areyouhappywithyourteeth?

　　Inthelastfiveyears,teethwhiteninghasbecomeverypopularamongyoungAmericans.Nowthetrend(潮流)hascometoChina.IfyouturnontheTVyoucanseetheHongKongpopstarKarenMokshowingherbrightwhiteteeth,saying.“Wanttobelikeme?Usewhiteteethstrips(牙贴)!”Youmayevenhavedecidedtobuyone.

　　Butwaitaminute.Dentistshavesomethingtosay.Theythinkthatkidsshouldnotusewhiteningproductsuntiltheyare16orevenolder.

　　“Wedon’tknowwhatwillhappenyet,"saysDr.NasrinAzim,adentistinChicago.“Studieshavenotbeendoneonyoungpeople.Iwouldn’tdoteethwhiteningonanyoneunder18.”

　　Theproblemwithwhiteningliesinthepulp(牙髓),theinnermost(最深处的)partofthetooth.Ithasthetooth’snerveending.Whenweeatveryhotorcoldthings,it’sthepulpthathurts.Kidshavelargerpulps.Thelargerpulpmightmaketeethmoresensitive(敏感的)towhiteningandgethurt.

　　Anotherproblemisthatthegums(牙床)aroundtheteethusuallychangeshapewithage.Soifsomeonewhitenshisorherteethduringchildhood,thedarker,naturalcolourmightshowlateraroundthegumline.Atthattime,yourteethwillshowtwocolours.Andthedarkercolourisdifficulttowhiten.

　　Themainfocusofthisarticleisondental(牙齿的)______.

　　A.careB.beautyC.cleaningD.illness

　　为什么很多人选C,如果光是因为这篇文章讲的是洁牙有关的方面就选C是不是有些片面,我这篇文章主要还是讲的为了保护我们的牙齿而不要去洁牙,我觉得应该选A,

　　还有为什么英语阅读理解的文意理解题我总是理解有偏差?应该怎样理解,只看表面还是看内涵.