单项选择题

A．Make posters.
B．Write a speech.
C．Answer questions.
D．Study chemistry.
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单项选择题
A．Twenty years.B．Four years.C．Twelve years.D．Twenty-four years.
A．Twenty years.
B．Four years.
C．Twelve years.
D．Twenty-four years.
单项选择题
A．Thirty percent.B．Twenty percent.C．Fifty percent.D．Ten percent.
A．Thirty percent.
B．Twenty percent.
C．Fifty percent.
D．Ten percent.
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