单项选择题

What is the significance of Hansen's study to the passage

A．It was the foundation of the research
B．It was the groundwork for the research
C．It was the research that was coded
D．It was the example used for the coding

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单项选择题

What is the purpose of this study

A．To record social habits
B．To analyze anti-social behavior
C．To analyze frequency and purposes of social gatherings
D．To analyze frequency and purposes of keeping diaries

单项选择题

What was coded

A．Writings about everyday life
B．A distinctive study
C．The months of January and July
D．The visitors the writers had