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1、YunnanProvinceneartheLancangRiver,theChinesepartoftheriverthatiscalledtheMekongRiverinothercountries.WangWeisoongottheminterestedincyclingtoo.Aftergraduatingfromcollege.wefinallygotthechancetotakeabiketrip.Iaskedmysister,"Wherearewegoing?"Itwasmysisterwhofirsthadtheidea
2、tocyclealongtheentireMekongRiverfromwhereitbeginstowhereitends.Nowsheisplanningourscheduleforthetrip. Iamfondofmysisterbutshehasoneseriousshortcoming.Shecanbereallystubborn.Althoughshedidn'tknowthebestwayofgettingtoplaces,sheinsistedthatsheorganizethetripproperly.Now,Ik
3、nowthattheproperwayisalwaysherway.Ikeptaskingher,"Whenareweleavingandwhenarewecomingback?"Iaskedherwhethershehadlookedatamapyet.Ofcourse,shehadn't;mysisterdoesn'tcareaboutdetails.SoItoldherthatthesourceoftheMekongisinQinghaiProvince.Shegavemeadeterminedlook—thekindthats
4、aidshewouldnotchangehermind.WhenItoldherthatourjourneywouldbeginatanaltitudeofmorethan5,000metres,sheseemedtobeexcitedaboutit.WhenItoldhertheairwouldbehardtobreatheanditwouldbeverycold,shesaiditwouldbeaninterestingexperience.Iknowmysisterwell.Onceshehasmadeuphermind,not
5、hingcanchangeit.Finally,Ihadtogivein. Severalmonthsbeforeourtrip,WangWeiandIwenttothelibrary.Wefoundalargeatlaswithgoodmapsthatshoweddetailsofworldgeography.FromtheatlaswecouldseethattheMekongRiverbeginsinaglacieronaTibetanmountain.Atfirsttheriverissmallandthewateriscle
6、arandcold.Thenitbeginstomovequickly.Itbecomesrapidsasitpassesthroughdeepvalleys,travellingacrosswesternYunnanProvince.Sometimestheriverbecomesawaterfallandenterswidevalleys.WewerebothsurprisedtolearnthathalfoftheriverisinChina.AfteritleavesChinaandthehighaltitude,theMek
7、ongbecomeswide，brownandwarm.AsitentersSoutheastAsia,itspaceslows.Itmakeswidebendsormeandersthroughlowvalleystotheplainswherericegrows.Atlast,theriverdeltaenterstheSouthChinaSea. PART2ANIGHTINTHEMOUNTAINS Althoughitwasautumn,thesnowwasalreadybeginningtofallinTibet.Ourleg
8、sweresoheavyandcoldthattheyfeltlikeblocksofice.Haveyoueverseensnowmenridebicycles?That’swhatwelookedlike!Along
