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Somescientistsbelieve.thatbirdssingsomeofthetimejustbec...
问题详情:Somescientistsbelievebirdssingsomeofthetimejustbecausetheyarehappy.However,theysingmostofthetime 61 averydifferentreason.Theirsingingis 62 (actual)awarningtootherbirdstostayoutofth...