单项选择题

A．Fifteen cigarette lighters.
B．Fifty cigarette lighters.
C．Sixty lipsticks.
D．An identity car
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单项选择题
A．A businessman in a store.B．A wander in the street.C．Amateur detective.D．A policeman with plain clothes.
A．A businessman in a store.
B．A wander in the street.
C．Amateur detective.
D．A policeman with plain clothes.
单项选择题
What is the passage mainly concerned with
A．Development and application of statistics.
B．Origin of descriptive statistics.
C．Limitations of inferential statistics.
D．Importance of statistics.
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