单项选择题

The storm sweeping over this area now is sure to cause ______ of vegetables in the coming days.

A．rarity
B．scarcity
C．invalidity
D．variety
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单项选择题
Human behavior is mostly a product of learning, whereas the behavior of an animal depends mainly on ______.
A．consciousness
B．impulse
C．instinct
D．response
单项选择题
Military orders are ______ and cannot be disobeyed.
A．defective
B．conservative
C．alternative
D．imperative
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