单项选择题

The hydra is a kind of______.

A．flatworm
B．coelenterate
C．sea anemone
D．nerve cell
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单项选择题
It can be inferred from the passage that insects do not have______.
A．brains
B．backbones
C．nerve cells
D．reflexes
单项选择题
The people who paid the greater part of the money used to run the newspapers were______.
A．owners
B．the man-in-the-street reader
C．advertisers
D．conservatives
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