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.
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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
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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