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the kitefin shark,which has few predators,the natural glow may act as a flashlight to light the ocean floor while searching for food.It could also help the large,slow-moving species from be- ing spotted by potential prey.However,the reason for the light on the shark'sfin(背鳍)is a mystery to scientists..“The lumi- nous pattern of the kitefin shark was unknown,and we are still very surprised by the glow on the dorsal fin,Dr Mallefet says. 12.What can be learned about the kitefin shark A.It glows to remind partners of enemies. B.It is the only shark that can produce glow. C.Light producing is influenced by hormones in its body. D.Its nervous systems causes the release of the hormones. 13.What's the last paragraph mainly about?