单项选择题

A．naturally
B．carefully
C．chemically
D．physically
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单项选择题
A．have added toB．has addedC．added toD．adding to
A．have added to
B．has added
C．added to
D．adding to
单项选择题
A．fromB．byC．inD．with
A．from
B．by
C．in
D．with
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