单项选择题

In the last century, old people did not have so many problems because ______.

A．they had big families
B．they lived with their children
C．the young were kind to the old
D．the society didn't change so rapidly
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单项选择题
In regard to the production of goods in greater quantities, the author states that ______.
A．the price of the goods would drop
B．the price of the goods would rise
C．the quality and the price would rise
D．the quality would rise and the price would drop
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