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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
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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