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
单项选择题
What does the author think about trying to find weaknesses in other people' s research
A．It should only be attempted by experienced researchers.
B．It may cause researchers to avoid publishing good work.
C．It is currently being done to excess.
D．It can be useful in planning future researc
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