閱讀理解Passengerpigeons(旅鴿)onceflewovermuchoftheUnitedStat...
問題詳情：閱讀理解Passengerpigeons(旅鴿)onceflewovermuchoftheUnitedStatesinunbelievablenumbers.Writtenaccountsfromthe18thand19thcenturiesdescribedflocks(羣)solargethattheydarkenedtheskyforhours.Itwascal...