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.
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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
单项选择题
The family in the western world
A．has changed a lot during the last two centuries
B．hasn't changed at all during the last two centuries
C．has changed a little during the last two centuries
D．has become bigger and bigger
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