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
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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
单项选择题
It is supposed that about half of the varieties of fish living in the dark depths have ______.
A．evolved more than one means of creating light
B．some power of illumination
C．developed extremely sensitive feelers
D．almost telescopic eyes
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