单项选择题

A．The man should try to be more understanding.
B．The man’s wife should be more understanding.
C．The man’s negative attitude may be derived from his childhood.
D．The pessimism of man’s wife may be the result of her past experiences.
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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 man with plain clothes.
A．A businessman in a store.
B．A wander in the street.
C．Amateur detective.
D．A man with plain clothes.
单项选择题
Which of the following, statements is true about descriptive statistics
A．It combines quantitative variables and qualitative variables,
B．It can be used to deal with only quantitative variables
C．It helps to summarize properties of a group of data.
D．It helps to make predictions using a sample of observations.
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