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托福听力练习-科学美国人60秒:盒子水母

2017-05-06 09:11:00来源：科学美国人60秒

点击查看>>科学美国人60秒音频：盒子水母

　　科学美国人60秒听力练习：盒子水母

　　科学美国人60秒英文文本

　　Box jellyfish have it over the rest of the jellyfishworld—they have true eyes, featuring corneas, lensesand retinas. They have a more sophisticatednervous system too. They still don’t have a realbrain, but those eyes enable them to actively huntprey. Other jellyfish just drift and hope. Well, notreally hope, because you can’t do that without abrain.

　　Anyway, it’s been long known that box jellies hadeyes, 24 in fact, of four different types. But nowresearchers have found that four of those eyes justlook up, and out of the water. The work appears in the journal Current Biology. [Anders Garm, Magnus Oskarsson and Dan-Eric Nilsson, Box Jellyfish Use Terrestrial Visual Cues for Navigation]

　　The studied jellies live in mangrove swamps and the studied eyes are always aimed at the treecanopy. By tracking the canopy the jellies can navigate to their preferred spots—where theirfavorite food, small crustaceans called copepods, are plentiful.

　　Their various eyes show that the jellies evolved a clever strategy. Rather than a single set ofpeepers that collect info for processing by a big brain, box jellies have different eye typesresponsible for informing different behaviors, with no brains. More evidence that it can be amistake to overthink a problem.


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本文关键字: 托福听力 科学美国人60秒

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