Despite the proliferation of other faster modes of transportation, the railroads remain the largest carriers of intercity freight in the United States.
A、schemesB
暂无解析
Solidgeometryhasenabledastronomerstocalculatethepositionsoftheheavenlybodiesrelativetooneanother.
Insectpestsareamongtheleadingcausesofcropfailure.
Amythical(imaginary)creature,thedragonwasbelievedtohavelion'sclaws,scalyskin,andfierybreath.
Themegaphone(microphone)makesthevoicesoundlouderbecauseitpointssoundwavesinonedirectionandkeepsthemfromspreadingoutinalldirections.
Peoplewhodonotsleepenoughtendtobecomeirritable.
