严复翻译的《天演论》,其原文的题目是()
Fishis________andexpensiveatthistimeoftheyearinthisarea.
TheaveragelifeexpectancyoftheRedIndiansis________.
Weweretoldthatthestonefigure_______backtothe16thcenturywasofgreatvalue.
TheMississippi,whichissometimescalled________,hasplayedavitalroleinthehistoryoftheUnitedStates.