单项选择题

A．By name.
B．By number.
C．By location.
D．By month.
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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
A．They have a big fight.B．They have a quarreling.C．They are breaking up.D．They will get married.
A．They have a big fight.
B．They have a quarreling.
C．They are breaking up.
D．They will get married.
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