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 pubhc attention
C．are tin improper subject for humor
D．have often been the laughing stock
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单项选择题
The best title for the text may be______.
A．Use Humor Effectively
B．Add Humor to Speech
C．Different Humor Strategies
D．Various Kinds of Humor
单项选择题
The author refers to a conveyor belt (L. 6, Para. 1) in order to ______.
A．illustrate the effects of movements in the upper layer of the earth
B．show how temperature differences depend on the positions of the continents
C．describe the complicated motions made possible by the ocean currents
D．account for the rising currents under min-ocean ridges
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