单项选择题

Coley took a(n) ______ attitude towards Prof. Stepp's studies.

A．enthusiastic
B．positive
C．neutral
D．questioning
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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.
单项选择题
According to Prof. Stepp, weedy plants are ______.
A．fast-growing and woody-tissued
B．slow-growing and soft-tissued
C．growing wild
D．growing where it is not wanted
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