单项选择题

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

A．enthusiastic
B．neutral
C．positive
D．questioning
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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
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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