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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单项选择题
Coley took a(n) ______ attitude towards Prof. Stepp's studies. A) enthusiastic C) neutral B) positive D) questioning
A．Coley took a(n) ______ attitude towards Prof. Stepp's studies.
B．enthusiastic
C．positive
D．neutral
E．questioning
单项选择题
Why wouldn't drug companies be interested in weedy plants
A．They consider weeds to be undesirable or troublesome plant.
B．They wouldn't like to develop traditional medicines.
C．They wouldn't believe in the medical effects of weedy plants.
D．They wouldn't be satisfied with the financial returns of developing news drugs from weeds.
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