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
According to the passage, which of the following is true
A．Aspirin is the largest suicide drug.
B．The side effects of aspirin are largely recognized by its users.
C．The best way to take aspirin is to chew the tablets before swallowing them with water.
D．Aspirin was available in the United States during the 19th century.
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