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
With what topic is the passage mainly concerned
A．The sensory organs of invertebrates.
B．The anatomy of tiny organisms.
C．The origin of the brain and central nervous system.
D．The importance of vision for fish and advanced mammals.
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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