单项选择题

A．To make preparations for a new publication.
B．To learn how couples spend their weekends.
C．To know how housework is shared.
D．To investigate what people do at the weekend.
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单项选择题
A．Once a week.B．Twice a week.C．Three times a week.D．Four times a week.
A．Once a week.
B．Twice a week.
C．Three times a week.
D．Four times a week.
填空题
When the environment is unstable and non-rewarding, we’ll try to get satisfaction ______ we can.
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