单项选择题

A．Prepare for history presentation together next Thursday.
B．Work out the difficult problems in history at once.
C．Work on history presentation together next Monday.
D．Find out the difficulties in the presentation immediately.
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单项选择题
A．Because machines reduced the price and made cigarettes popular. B．Because cigarette industry only began to develop in the 1870’s. C．Because factories produced more cigarettes than before. D．Because people began to accept smoking as a habit.
A．Because machines reduced the price and made cigarettes popular.
B．Because cigarette industry only began to develop in the 1870’s.
C．Because factories produced more cigarettes than before.
D．Because people began to accept smoking as a habit.
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