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