单项选择题

What kind of packaging do they decide to use
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How long has the magazine been on sale
A．For one year.
B．For eighteen months.
C．For two years.
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Between 1945 and 1950 production increased
A．every year by 20, 000.
B．from 20,000 to 230, 000.
C．by 20,000 to 230, 000.
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