单项选择题

A．Thirty percent.
B．Twenty percent.
C．Fifty percent.
D．Ten percent.
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单项选择题
A．City officials.B．Experts in various institutions.C．Newly-graduated university students.D．Some famous scientists.
A．City officials.
B．Experts in various institutions.
C．Newly-graduated university students.
D．Some famous scientists.
填空题
D
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