单项选择题


A．and
B．or
C．as
D．therefore
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单项选择题
The purpose of the article is to tell us ______.
A．the effect of antibiotics
B．not to use antibiotics unless necessary
C．that antibiotics are harmfull
D．that our natural defence systems are superior to antibiotics
单项选择题
A．inB．upC．afterD．for
A．in
B．up
C．after
D．for
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