第四部分写作第一节短文改错事Offering help is always a good tradition in ourcountries. It is believed that by heelp anothercountnhelpingperson, you are helping yourself. Helping others dodohave a significant effect on a person's happiness. Eventhough we usually feel the urge A compete with othertotaktime to assist otherseneficial to us. Besides, helping people is a goodbenefitway to build trust, particular if you never expect orparticularldemand something to be given to you in retum.anythingNowadays, a rising number of individaIs areready to assist tht others. This has resulted from awonderful community, which people live in harmonynIwherewith each other

8.D【解析】如图所示,连接BF,BF.由AF·AF0,得∠FAF=90°.由对称性可知四边形AFBF是矩形,|AF|=|BF|,|FF|=|AB=2c=5,2·3AF|=4AF'|,|AF|=3,AF|=4.∴2aAF|+|AF|=72…b2=a2-c2=6.∴C的方程为+x=1,即4x+2=1.故选D4

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