Despitetheproliferationofotherfastermodesoftransportation,therailroadsremainthelargestcarriersofintercityfreightintheUnitedStates.
A、schemesFoodmustbemoistinordertohaveataste.
Thewheelsofthefirstroadvehicleswerefashionedfromcrudestonedisks.
Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.
ThefuturesurvivalofthebaldeagleisstillanimportantAmericanecologicalconcern.
TheNativeAmericaninterpreterSacajaweawasavaluablememberoftheLewisanddarkexpeditionin1805.
