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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单项选择题
When were pulse rates taken
A．After every exercise period.
B．Every time the ratio of active riding was increased.
C．Every day.
D．After each step-test.
单项选择题
Before the nineteenth century ______.
A．people got married because they loved each other
B．people could choose whom they wanted to marry
C．people married very young
D．families usually arranged marriages
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