单项选择题

The American society is______ an exceedingly shaky foundation of natural resources, Which is connected with the possibility of a worsening environment.

A．established on
B．affiliated to
C．originated from
D．incorporated with
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单项选择题
Small farms and the lack of modern technology have______ agricultural production.
A．blundered
B．tangled
C．bewildered
D．hampered
单项选择题
She worked hard at her task before she felt sure that the results would______ her long effort.
A．justify
B．testify
C．rectify
D．verdict
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