单项选择题


A．reasoning
B．preventing
C．deriving
D．developing
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单项选择题
Coley took a(n) ______ attitude towards Prof. Stepp's studies.
A．enthusiastic
B．positive
C．neutral
D．questioning
单项选择题
Why are weedy plants a source of traditional medicines according to Coley
A．They are within human reach.
B．They grow on cultivated ground.
C．They crowd out cultivated plants.
D．They grow profusely where it is not wanted.
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