单项选择题

A．The newspapers remain thin and flexible.
B．The presses can print larger sheets of paper.
C．The ink is fast drying and clear.
D．The ink can be changed and retested.
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单项选择题
A．It was produced before AD 400.B．It was produced before AD 200.C．It was produced before AD 100.D．It was produced before AD 50.
A．It was produced before AD 400.
B．It was produced before AD 200.
C．It was produced before AD 100.
D．It was produced before AD 50.
填空题
Prof. Weston agrees to sign her card.
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