【導(dǎo)讀】haveshowninterestinthisnewandunusualsport.Butthoughaircyclistsmaylearnhowtoflyovershortdistances,andmay,eventually,evengetacrosstheEnglishChannel,itisdoubtfulwhethertheywilevercycleacrosstheAtlantic.Leson67Volcanoes火山HarounTaziefthePolishscientist,hasspenthislife-timestudyingactivevolcanoesanddeepcavesinalpartsoftheworld.In1948,hewenttolakeKivuintheCongotoobserveanewvolcanowhichhelaternamedKituro.