参考答案

正确答案：B
答案为 B。根据第一段第二至第五句， Actually， their talk may be as meaningful as much of our own．For example，some sea animals use their "voices" to locate their food in the ocean expanses；others use their "voices" to let their fellows know of their locations；and still others，as a means of obtaining mates．Sometimes, "speaking" may even mean the difference between life and death to a sea animal．It appears in some cases that when a predator approaches，the prey depends on no more than the sounds it makes to escape 作出该项选择。选项 A中only不确切；选择 C和D在文中都没提到。