In the text below some words are missing. Drag words from the box below to the appropriate place in the text. To undo an answer choice, drag the word back to the box below the text.
下面的文本缺了一些词。请把词框里的词拖到文中合适的位置；要撤销选择，把词拖回文本下方的词框即可。
Electric eels are born to shock. Thanks to cells called electrocytes which, stacked like batteries, make up 80% of their bodies, these cunning South American can deliver debilitating blows of up to 600 volts to their prey. But they’ve harnessed their electricity to pack even bigger punches. Last year, Vanderbilt University biologist Kenneth Catania revealed electric eels bring their positively charged head and negatively charged closer together to generate a more powerful .
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