单项选择题

Can you describe the _____ by which paper is made from wood

A．origin
B．source
C．measure
D．process
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单项选择题
The old couple _____ a hard living by selling vegetables every day on the roadside.
A．passed
B．saved
C．lived
D．earned
单项选择题
Tension has been ___ between the employers and the workers on strike.
A．built up
B．put up
C．grown up
D．pulled up
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