Urbanrenewalprogramsstrivetoupgradeareasthatarebecomingslums.
A、reproachBats fly, rather than glide, and thus are the only mammals capable of true flight.
The future survival of the bald eagle is still an important American ecological concern.
Alligatorsstillexistinsomeofthedank潮湿swampsandbayous小海湾ofAlabama'scoastalregions.
TheNativeAmericaninterpreterSacajaweawasavaluablememberoftheLewisanddarkexpeditionin1805.
Somechildrendisplayanunquenchable难以抑制的curiosityabouteverynewthingtheyencounter.
