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
Young scientists cannot realize______ soon that existing scientific knowledge is not nearly so complete, certain and unalterable as many textbooks seems to imply.
A．so
B．very
C．too
D．such
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