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
The foreign student advisor recommended that she______ more English before enrolling at the university.
A．studied
B．study
C．would study
D．was studying
单项选择题
He spoke so______ that even his opponents were won over by his arguments.
A．bluntly
B．convincingly
C．emphatically
D．determinedly
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