单项选择题

A．Pessimistic.
B．Optimistic.
C．Radical.
D．Practical.
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单项选择题
A．Fifty students.B．Forty students.C．Twenty-five students.D．Fifteen students.
A．Fifty students.
B．Forty students.
C．Twenty-five students.
D．Fifteen students.
填空题
extends
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