单项选择题

The author indicates in the passage that conflict ______.

A．is an inevitable struggle resulting from competition
B．reflects the struggle among social animals
C．is an opposition among individual social entities
D．can be avoided

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单项选择题

The phrase function in the disservice of one another (Line 7. para. 1) most probably means ______ .

A．betray each other
B．harm one another
C．help to collaborate with each other
D．benefit one another

单项选择题

Which of the following cities is NOT mentioned in the passage as a center of Jazz

A．New York.
B．Washington D. C.
C．Chicago.
D．New Orleans.