单项选择题

27（）

A．As
B．For
C．From
D．By

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单项选择题

26（）

A．higher
B．lower
C．larger
D．smaller

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.