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
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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
单项选择题
According to the passage, what helps to coordinate the complex physical activity of a mammal
A．The cerebellum.
B．The forebrain.
C．The cerebrum.
D．The midbrain.
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