单项选择题

A．Negative.
B．Critical.
C．Neutral.
D．Positive.
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单项选择题
A．The location of certain ocean rocks.B．The effect of water pollution on barnacles.C．The medical value of some synthetic products.D．The composition of the barnacle’s glue.
A．The location of certain ocean rocks.
B．The effect of water pollution on barnacles.
C．The medical value of some synthetic products.
D．The composition of the barnacle’s glue.
单项选择题
A．November.B．December.C．June.D．March.
A．November.
B．December.
C．June.
D．March.
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