Amanhadtwosons.Theyweretwins.Theywerebornatalmostthesam...
问题详情：Amanhadtwosons.Theyweretwins.Theywerebornatalmostthesametimeand1ookedexactlyalike．Butinoneimportantway,theywereverydifferent.Oneofthemwasanoptimist,whiletheotheronewasapessimist.Anoptimistissom...