英语听力:自然百科 大迁徙之繁衍生息 Need to Breed—16(在线收听

 Tonight the newly winged young would join the feeding frenzy.They are now fully fledged members of the colony,ready to investigate the bounty of this land,and dark in the dusk with breathtaking numbers once again.

 
Morning in Costa Rica ,and the army is on the move again.Each day about a third of the nest spills out in the deluge of ants.And for moat of their prey,resistance is futile.
  原文地址:http://www.tingroom.com/lesson/zrbaike/2011/260341.html