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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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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单项选择题
Most of the marine species living in the darkest depths have ______.
A.learned to live without light
B.evolved ingenious devices to help them
C.found ways to supply their own light
D.developed extremely sensitive eyes
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