单项选择题


A．measured
B．controlled
C．taken
D．settled
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单项选择题
What is the significance of weed research according to Stepp
A．It would help to maintain the diversity of plants.
B．It would contribute to the growth of cultivated plants.
C．It would promote traditional medicines.
D．It will result in more modem health care facilities.
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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