单项选择题

Co-opration means ______.

A．working for others
B．working for oneself
C．working together for the interests of all
D．working together for the benefit of the whole world
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单项选择题
Vienna was a rich city ______.
A．before 1955
B．before World War Ⅰ
C．after World War Ⅱ
D．during World War Ⅱ
单项选择题
According to the passage, Vienna was once a center of ______.
A．traffic
B．trade and science
C．art and music
D．B and C
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