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下面的文本有一些空格。点击每个空格会出现一组选项，请为每个空格选出最合适的答案。
The horned desert viper’s ability to hunt at night has always puzzled biologists. Though it lies with its head buried in the sand, it can with great precision as soon as prey appears. Now, Young and physicists Leo van Hemmen and Paul Friedel at the Technical University of Munich in Germany have developed a computer of the snake’s system to explain how the snake “hears” its prey without really having the ears for it. Although the vipers have internal ears that can hear between 200 and 1000 hertz, it is not the sound of the mouse scurrying about that they are detecting. “The snakes don’t have external ,” says van Hemmen. “So, unless the mouse wears boots and starts stamping, the snake won’t hear it.”
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