单项选择题

In the long run, English learning, difficult as it is, is ______ to a learner in his or her career development.

A．profitable
B．advantageous
C．prominent
D．rewarding
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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
单项选择题
He managed to save ______ he could to tend the homeless boy.
A．what little time
B．so little time
C．such little time
D．how little time
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