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prep1-34 Hundreds of species of fish generate and discharge electric currents, in bursts or as steady electric fields around their bodies, using their power either to find and attack prey, to defend themselves, or also for communicating and navigating. (A) either to find and attack prey, to defend themselves, or also for communicating and navigating (B) either for finding and attacking prey, defend themselves, or for communication and navigation (C) to find and attack prey, for defense, or communication and navigation (D) for finding and attacking prey, to defend themselves, or also for communication and navigation (E) to find and attack prey, to defend themselves, or to communicate and navigate 如果A中or后面改成to communicate and navigate对不对？either...or是不是只能有两个项？谢谢 | 
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发表于 2009-3-6 19:21:00
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