单项选择题


A．that
B．if
C．what
D．whether
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单项选择题
How does aspirin reduce fever
A．It slows down human reactions to fever.
B．It prevents the formation of the fever-related chemical reactions.
C．It interferes with the formation of some acids.
D．It makes human body unconscious of pains.
单项选择题
People in ancient Greece understood that______.
A．some tree bark and leaves could be used as aspirin
B．some tree bark and leaves had certain medical effects
C．aspirin was a good pain killer
D．aspirin could cure arthritis
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