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-operation 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
In which year was aspirin first sold
A．This year.
B．1899.
C．1915.
D．The 19th century.
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