单项选择题

The people in that remote area still live on ______ means because the economy there is underdeveloped.

A.difficult
B.modest
C.arduous
D.domestic
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单项选择题
The boss stressed the criterion that a qualified waiter must do every service ______ the satisfaction of his customers.
A.for
B.by
C.on
D.to
单项选择题
According to the passage, up to now, antidrug education ______.
A.has made all people see the danger of drugs
B.has succeeded in dissuading people from using drugs
C.has been effective only to a certain degree
D.has proved to be a total failure
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