第四部分写作第一节短文改错It's been two vears when I joined the campus radiostation. In the past two years. I had done severalinterviews. Every time I finish writing an article. I amproud of mysel! a bcing able to introduce my schoolmatesforto the things I've seen them. It was difficult at times. butwhen I saw my stories publish in our school newspaperpublishedyou knew that it was something worth doing. My parentsteachers and schoolmates congratulated me on allwhich I did. When I shared a new story with them, Ihat或 whichfelt more than happier. The greatest thing about being theappyreporter is exchanging idea with othersideas

18.解:(1)由正弦定理得2 sin acos b- sin Ccos B= sin Bcos c,即2 sin Acos b=sin(B+C),B由于B∈(0,π),故B=丌,……(2)若选①②,依题意有a=2c,B=,则可求得b=3c,A=,S△e2,B=+E,=环+2,欧+EP,即了=了…s△ABC…………………………………………………………………12分若选①③,依题意有a=2c,B5,则b=5,A一号,Sm一签∠ABM=,BM=1,AB=y2…∴S△ABC=c2812分若选②③,B=+C…E=(1+2,E+E4=4(a2+2acos3+c),a2+ac+=7又BM为角平分线,S△Mc- acsinB=S△Ax+SM=c1·sin+a、1、多/3ac=a+c,平方得3a22=7+a,解得ac=1+√85S△ABc= actin3√3+√2552412分

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