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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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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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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