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
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
单项选择题
According to the passage, what do student researchers often learn when they discuss their work in class
A．Other students rarely have objective comments about it.
B．Other students do not believe the researchers did the work.
C．Some students feel that the conclusions are too obvious.
D．Some students do not understand the meaning of the researchers' questions.
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