单项选择题

In discussing the marketing concept, the author focuses on ______.

A．its main characteristic
B．its social impact
C．its possible consequence
D．its theoretical basis
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单项选择题
Which of the following statements is TRUE according to the passage
A．Earthquake destruction is declining.
B．Earthquake forecast is improving.
C．Man is no longer fearful of earthquakes.
D．Man is capable of conquering earthquakes.
单项选择题
Man's research on earthquake forecast at present is to ______.
A．reduce the loss from earthquake disasters
B．lower the frequency of earthquakes
C．release the energy that causes earthquakes
D．analyze the relationship between different earthquakes
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