单项选择题

The behavior of an animal depends mainly on _________ , whereas human behavior is mostly a product of learning.

A．instinct
B．impulse
C．consciousness
D．response
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单项选择题
The harder the shrub is to grow, _________.
A．the higher price it is
B．the higher price it would have
C．the higher the price is
D．the higher is the price
单项选择题
Most environmental problems exist because adequate measures for preventing them _________ taken in the past.
A．was not
B．were not
C．were not being
D．being not
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