单项选择题

His concluding remarks had a tremendous ______ on the audience.

A．response
B．impact
C．affection
D．assertion
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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
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
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