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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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.
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单项选择题
According to the passage, what is one major criticism students often make of published research
A．The research has not been written in an interesting way.
B．The research has been done in unimportant fields.
C．The researchers did not adequately establish the relationships involved.
D．The researchers failed to provide an appropriate summary.
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