【单选题】{{B}}第二篇{{/B}}
A、male zebra finch(雀科呜鸟)chirps(呜)away to himself. Suddenly he notices a female bird nearby. He realizes he has an audience and immediately changes his song.Can the female tell the difference in his performanceAccording to a new study, the female zebra finch knows.And she prefers the special trills (啭音)he creates when he sings to her.A、male zebra finch changes his song when singing to a female in ways that people can barely detect.But the female finch can tell the difference.
Scientists had noticed slight variations in the songs of male zebra finches based on whether they were singing alone or whether there was a female(and potential mate) nearby. With an audience,the males sped up the pace of their songs and controlled the notes they useD、
For this study,researchers SarahC、Woolley andAllisonDoupe at the University ofCalifornia, San Francisco decided to focus attention on the listening females, which have not been well studied in the past.
In the study,Woolley andDoupe set up a long cage with a sound speaker at each enD、Ore broadcast the sound of a male zebra finch singing to himself,like someone singing in the shower. The other speaker broadcast a male performing for a female audience,as if he was giving a concert.
Female birds were placed between the two speakers. Some of the birds had mates,others didn’t. The females shifted around a bit, and then most of them hopped over to sit beside just one speaker.All the birds that made a clear choice liked songs meant for a female audience,even if they’d never met the male.
Mated females also had a chance to listen to two different performance songs. One from an unknown male, and one from their mate. They spent more time listening to the concert version of their mates’songs. This suggests that after a while,females learn to recognize -- and prefer -- the songs of their mates.
Scientists then studied the brains of the females. They found certain areas of the brain perked up(活跃起来)when the birds listened to the concert songs. These brain areas may be involved in recognizing and evaluating the songs, and storing the memories of them.
his research deals with what’s called directed communication, when the communicator, or sender, focuses the message for a specific audience. One example is the way moms speak to their babies. Mothers around the world use the same sort of high-pitched sing-song chatter(喋喋不休),and the babies respond best to those sounds. Songbirds are one of the only other species known to learn their communication in this case their songs.
B．Zebra finches and their life
C．Frequencies of birdsongs
D．Birdsongs as communication
网考网参考答案：D
网考网解析：
[解析] 文章所涉及的研究旨在发现雄性斑胸草雀歌声是否会在不同的情况下发生变化，其结果是，它们在为雌性斑胸草雀歌唱时，会改变声调和速度。这就是说，它们的歌声实际上是一种交流方式，故选D。 document.getElementById("warp").style.display="none"; document.getElementById("content").style.display="block"; 查看试题解析出处>>
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