| {{B}}Listening to
Birdsong{{/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 performance According 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,res A. Female zebra finches are too shy to sing before males B. Male zebra finches sing louder than females C. Male zebra finches change their songs to attract females D. Female zebra finches like to listen to unknown males sing 更多"{{B}}第二篇{{/B}} "的相关试题: [单项选择]第二篇
Mind-reading Machine
A team of researchers in California has developed a way to predict what kinds of objects people are looking at by scanning (扫描) what’s happening in their brains.
When you look at something, your eyes send a signal about that object to your brain. Different regions of the brain process the information your eyes send. Cells in your brain called neurons (神经元) are responsible for this processing.
The fMRI (functional Magnetic Resonance Imaging) (功能性磁振造影) brain scans could generally match electrical activity in the brain to the basic shape of a picture that someone was looking at.
Like cells anywhere else in your body, active neurons use oxygen. Blood brings oxygen to the neurons, and the more active a neuron is, the more oxygen it will consume. The more active a region of the brain, the more active its neurons, and in turn, the more blood will travel to that region. And by using fMRI, scientist
A. The magnetic system in the brain. B. The central part of the heart. C. Oxygen-rich blood. D. Neurons in the brain. [单项选择]{{B}}第二篇{{/B}}
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