单项选择题

According to a growing number of experts, it is already technically ______ to construct a pioneering space colony, powered by solar energy.

A．practical
B．flexible
C．feasible
D．beneficial
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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
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
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