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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