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
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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
单项选择题
Which of the following titles would best describe the content of the text
A．Several Theories of Ocean Basin Formation.
B．Temperature Differences Among the Oceans.
C．The Traditional View of the Oceans.
D．Motions and Ocean Currents.
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