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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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
What are the implications of the study
A．Psychological health is extremely important in present society.
B．Brain-scanning technology contributes much to psychological studies.
C．The "rule of majority" would be the best choice to resolve conflicts.
D．People may unwillingly yield to majority opinions.
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