单项选择题

During the 1800s ______.

A．marriage involved two families
B．parents arranged marriages
C．marriage joined two people
D．parents chose husbands for their daughters
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单项选择题
The step-test was given ______.
A．at the beginning and at the end of the 7-week period
B．after each exercise period
C．only at the beginning of the 7-week period
D．only at the end of the 7-week period
单项选择题
Social scientists do NOT study ______.
A．marriage in different countries
B．the differences between life in rural and urban areas
C．how a satellite is launched
D．family life
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