它从汩罗江的浪波里悄然走来,几千年前的那朵浪花犹如一滴水彩,把中华大地染成棕叶式的青绿,从此让每一个角落都弥漫着亘古不变

汨罗江 在湖南-岳阳
发源于江西修水县,往西流经平江县、汨罗市（汨水与罗江在县境内汇合),至湘阴县进入湘江.它的干流长度253公里,流域面积达5543平方公里,为湘江在湘北的最大支流.
至今仍叫汩罗江

解题思路：比赛成绩是当y=1000时对应的x的值，所以须求后段的直线解析式．

设后段的解析式为y=kx+b，由图象过（4，800）和（4.5，925），
得

800＝4k+b
925＝4.5k+b，
解之得

k＝250
b＝−200．
所以解析式为y=250x-200，
当y=1000时250x-200=1000，解之得x=4.8．
所以该龙舟队的比赛成绩是4.8分钟．

点评：
本题考点： 一次函数的应用．

考点点评： 分段函数必须搞清楚各段表示的意义及所求问题对应的部分．

解题思路：比赛成绩是当y=1000时对应的x的值，所以须求后段的直线解析式．

设后段的解析式为y=kx+b，由图象过（4，800）和（4.5，925），
得

800＝4k+b
925＝4.5k+b，
解之得

k＝250
b＝−200．
所以解析式为y=250x-200，
当y=1000时250x-200=1000，解之得x=4.8．
所以该龙舟队的比赛成绩是4.8分钟．

点评：
本题考点： 一次函数的应用．

考点点评： 分段函数必须搞清楚各段表示的意义及所求问题对应的部分．

The 340 B.C.,the patriotic poet,the country doctor Chu,Qu-Yuan,faces the pain of the 亡 country,on May fifth,the grief and indignation ground the bosom embrace the big stone hurl 汩 river.To not make the fish shrimp hurt his body,people pack the rice devotion to the tube-shaped container in succession river.Hereafter,for meaning to respect adore Qu-Yuan and thinking of,each to this day,people then the tube-shaped container pack a rice,the devotion sacrifice,this be the our country the earliest Zong-zi-the cause of"the tube glutinous rice dumpling".
Why use 艾 leaf or 苇 leaf,lotus leafs to make a Zong-zi again afterwards?《The beginner record 》win to have so of jot down:The Han Dynasty sets up 武 for year,the long sand person dreams one person in the evening,claiming to be three 闾 doctor(Qu-Yuan's officer's)s,saying to him:"The thing that you offer sacrifices to,all the flood dragon win by river stole to go to,hereafter can use 艾 a leaf to wrap up,tie～up the many colors silk thread good,flood dragon the most afraid these two kind things."Hence,people then with" 菰 the leaf bind the 黍 ",make into" Cape 黍 ".Pass from generation to generation,gradual development is our country Dragon Boat Festival food.
Qianlong's emperor in Manchu dynasty,Dragon Boat Festival after the temple win ate nine son glutinous rice dumplings,the dragon 颜 exultation,be full of praise,compose poem on occasion a gladly:"4:00 spend 巧 unexpectedly,nine son glutinous rice dumplings contend for lately."Nine son glutinous rice dumplings:BE a Zong-zi of a kind of,is nine glutinous rice dumplings to connect a string,is greatly small,big of at up,small of at under,the shape is each different,very good-looking.And nine kinds of silk threads of colors is firm to become,formation a riot of colour.Nine son glutinous rice dumplings are the gifts that donates friends and relatives mostly,if the mother gives to get married of the daughter,mother-in-law give the gift of the newly married etc.,because"Zong-zi" homophonic"neutron",folks' hasing already ate"Zong-zi" can get the son's customs,past"nine son glutinous rice dumplings"ses would be the symbol that many sons have another blessing.Poet WU2 MAN4 YUN2 in Manchu dynasty,also write to have a Psalter that lauds nine son glutinous rice dumplings:"Bind and then connect the tube rice 宿 spring,nine son the colourful wisp is firm layer after layer,the green 菰褪 exhausted cloud skin white,smile to say the kitchen 娘藕 reply loose."