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第二节（满分25分）阅读下面材料，根据其内容和所给段落开头语续写两段，使之构成一篇完整的短文
Afterwateringthetreesandgrassinouryardyesterday,I'mpleasedtoseethatitisrai-ningthismorning.Thetreesandgrassaredryandtheyaredyingforlackofwater.Wereallyneedsomeshowerstogivetheyardadrinkandbringfreshnesstotheairandcoolness,mak-ingthemorningpleasant.Thereisnothingquitelikearainydayinspringandthesimplejoysitbrings.Infact,asaboyIhatedrainydays.TheymeantthatIwasstuckinthehouseandcouldn'tgoouttoplay.ItwasonlyastheyearspassedthatIrealizedtherecouldbenowaterwithoutrainandtherecouldbenolifewithoutwater.Thetruthisthatrainisagiftfromna-ture.NowIlookateachgentlerainfallwithasmileandknowthatnatureisgivingtheworldandusthewaterweneedtolive.Ofcourse,weallpreferthesunshineaftertherain.Thesungivesuslight.Itenergizesus.Thewhitecloudsandblueskiesjustnaturallymakeusfeelgood.Whenmythoughtsare些racing,mymothercomesover."Henry,yourmorningcoffee.It'srainingtoday.Whydon'tyousleepmore?"Ismileandsay,"Mum,itisaniceday.Aftertherain,theplantsinour烯yardwillcomealiveagain.ButIhaveanimportantthingtodotoday."Sheseemstounder-standandsays,"Goahead,baby.Haveagoodday!"Mayberainydaysgiveusachancetoresttoday,andevenrestonthefieldsforthenextday.Iknowtherewouldbenomorningcoffeeorafternoonteawithoutrain.IthinkwhenIgoouttohelpothersintheraintoday,Iwillsendthankstonature.Whentherainfallsonmy烟head,itbringsmegreatfun,butitalsocausestroubleforsomehomelesspeopleonthestreets.Ontheotherhand,therainseemstomakemealittlesad.Idecidetowalkoutandseeifthereisanyoneinneed.注意：$1.续写词数应为150左右；2.请按如下格式在答题卡的相应位置作答
Iamwalkingalongthestreets.Idecidetohelpthepersoninneed.
分析先根据椭圆的标准方程，求得半焦距c，进而根据椭圆的定义求得|MF1|+|MF2|的值，进而利用余弦定理求得|MF1|和|MF2|的关系式，联立方程求得|MF1|•|MF2|，最后根据三角形面积公式求得三角形的面积．
解答解：由椭圆$\frac{{x}^{2}}{25}$+$\frac{{y}^{2}}{16}$=1，得a=5，b=4，c=$\sqrt{{a}^{2}-{b}^{2}}$=3．
根据椭圆定义，有|MF1|+|MF2|=2a=10．
在△F1MF2中，由余弦定理，得到
|F1F2|2=|MF1|2+|MF2|2-2|MF1|•|MF2|•cos∠F1MF2．
即36=|MF1|2+|MF2|2-2|MF1|•|MF2|•cos$\frac{π}{6}$，
36=|MF1|2+|MF2|2-$\sqrt{3}$|MF1|•|MF2|
=（|MF1|+|MF2|）2-（2+$\sqrt{3}$）|MF1|•|MF2|=102-（2+$\sqrt{3}$）|MF1|•|MF2|，
解得|MF1|•|MF2|=64（2-$\sqrt{3}$）．
△F1MF2的面积为：S=$\frac{1}{2}$|MF1|•|MF2|sin∠F1MF2
=$\frac{1}{2}$×64（2-$\sqrt{3}$）×sin$\frac{π}{6}$=16（2-$\sqrt{3}$）．
点评本题主要考查了椭圆的应用．特别是利用椭圆的定义解决椭圆的实际问题，同时考查解三角形的余弦定理和面积公式的运用，属于中档题．
