单项选择题


A．invented
B．made
C．taken
D．published
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单项选择题
A．onB．afterC．inD．by
A．on
B．after
C．in
D．by
单项选择题
One of the reasons why the long-term trend of prices has been downwards is that ______.
A．technological innovation can promote social stability
B．political instability will cause consumption to drop
C．new farming and crop technology can lead to overproduction
D．new sources are always becoming available
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