单项选择题

A reservoir is used ______.

A．to keep the fields wet
B．to store water
C．to join canals
D．to prevent farmers from getting water

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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

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

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