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文件名称:通道3 birds如何歌曲阅读真题.pdf
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Passage1292015-07-11-3HowBirdsAcquireTheirSongs

1.Mostsongbirdshatchinthespringandthenmerelylistentothesongsofadultmalebirds

untilsometimeinlatesummerorautumn,whentheadultsstopsinging,nottoresumeuntil

ofwi