单项选择题

Many evolutionary biologists believe that

A．emotions do not exist.
B．emotions contribute to survival.
C．emotions serve no other purpose than giving meaning and depth to life.
D．only humans are capable of emotions.

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热门试题

单项选择题

To study animal emotions, scientists should

A．set up improved and refined skillful experiments.
B．analyze human emotional.
C．distinguish what is emotional and what is conditioned.
D．learn from animal behaviorists.

单项选择题

The example of a gull chick pecking the parent's bill illustrates that

A．behaviors can be learned responses and have no emotional content.
B．some animals have no emotions.
C．it takes time for animals to be conditioned.
D．emotions are very important to survival.