单项选择题

What does this paragraph imply

A．Most of us don't get enough exercise.
B．We should exercise 15 minutes per day.
C．A high pulse rate is more healthy.
D．Regular exercise can strengthen our heart.

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单项选择题What did Group A do in their program

A．They stepped up and down on a bench every day.
B．The didn't do any exercise.
C．They rode on an exercycle every day.
D．They pushed handle bars every day.

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

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

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