单项选择题

It can be inferred from the text that public services ________.

A．have benefited many people
B．are the focus of public attention
C．are an inappropriate subject for humor
D．have often been the laughing stock
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单项选择题
To make your humor work, you should ________.
A．take advantage of different kinds of audience
B．make fun of the disorganized people
C．address different problems to different people
D．show sympathy for your listeners
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