单项选择题

A．The lens.
B．The price.
C．The flash.
D．The leather case.
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单项选择题
Rosa Parks was the first black person to refuse to give up a seat on the bus for a white person.
A．Y
B．N
C．NG
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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