单项选择题

A．Your ears.
B．Your body.
C．Your brain and your ears.
D．Your ears and your whole body.
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单项选择题
A．By name.B．By number.C．By location.D．By month.
A．By name.
B．By number.
C．By location.
D．By month.
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.
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