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单项选择题
The fish that have developed long feelers use them to ______.
A．recognize food particles
B．collect food
C．locate food by sense of smell
D．both A and B
单项选择题
According to the selection some species that live where there is no light have ______.
A．long, sensitive feelers
B．luminous fins
C．enormous owl-like eye
D．no actual eyes
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