单项选择题

The American society is ______ an exceedingly shaky foundation of natural resources, which is con nected 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
We looked for a table to sit down, but they were all ______
A．reserved for
B．engaged in
C．used up
D．taken up
单项选择题
In the long run, English learning, difficult as it is, is ______ to a learner iii his or her career devel- opment.
A．profitable
B．advantageous
C．prominent
D．rewarding
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