单项选择题

It's said that plants __________ with a virus give off a gas that stimulates disease resistance in neighboring plants.

A．interacted
B．inflicted
C．infected
D．induced
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单项选择题
Scientists speculated that __________ population growth and dwindling resources may force human to look to the sea for food.
A．unavoidable
B．unconventional
C．unrestrained
D．unprecedented
单项选择题
The advocates of nature urged more green coverage on __________ lots.
A．vain
B．valid
C．vacant
D．vague
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