单项选择题
22（）
A．at
B．for
C．profitable
D．as
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单项选择题
What point is the author making by stating that farmers could carry nearly all their tools on their backs ( )
A．Farmers had few tools before the agricultural revolutions.
B．Americans were traditionally self-reliant.
C．Life on the farm was extremely difficult.
D．New tools were designed to the portable.
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单项选择题
Which of the following can be inferred from what Thomas Jefferson said ( )
A．Europe was changing more quickly than America.
B．Europe had greater need of farm machinery than America did.
C．America was finally running out of good farmland.
D．There was a shortage of workers on American farms.
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