【A）realizeB）publicC）experimentD）pollutionE）plasticThescientistwasinahurry．Shehadtogetsomewaterforher（46）___beforedarknessfell．Shewastestingthewaterintheriversthatwentintotheocean．Herjob】

　　A）realize B）public C）experiment D）pollution E）plasticThescientistwasinahurry．Shehadtogetsomewaterforher（46）___beforedarknessfell．Shewastestingthewaterintheriversthatwentintotheocean．Herjobwastofindoutthecauseof（47）___intheseaatnearbybeaches．Sheliftedoutthewaterandlookedangrilyattherubbishinit．Oldclothers，（48）___bagsandpiecesofpaperwereinthedirtywater．“Don'tpeople（49）___thateverythingtheythrowontothestreetgetswashedintorivers？Andtheyleadrightintotheocean!”shesaidloudly．“Howmanyyearswillittaketomakeitcleanagain？”