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2.A【解析】由题意得cosA=十c2-a2bc2bc号，因为A为三角形的内角，所以si血A=V-cosA=号，则sin(B+C)=sinA=手，故选A项.
第二节书面表达Housework in My LifeHowever busy I am with my study,I will sparetime to do my share of the housework.From an earlylife,I started to assist my parents in cooking,preparing cooking materials,washing vegetables andcutting them up.As time goes by,I've managed tocook some simple dishes on my own.Duringtheholidays,I am willing to prepare breakfast for myfamily,which makes them happy and relieved.In the course of cooking,due to my carelessness,laughter often fills the kitchen,taking the stress ofwork away.In addition,I also have a betterunderstanding of how enjoyable cooking is and howtired my parents must be cooking on a routine basis.Above all,cooking brings me a great sense ofachievement.
