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.
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单项选择题
According to the author, most scientists explain animal behaviors in terms of reflexes and conditioning because
A．only humans have emotions.
B．only animals have both learned and emotional behavior.
C．emotions are more difficult to measure and observe than reflexive behavior.
D．reflexes and conditioning will lead to better understanding of animal emotion.
单项选择题
The immigrants' flushing in was considered a threat to American value mainly because
A．the immigrants came from poverty-stricken nations of southern and eastern Europe.
B．the immigrants had been accustomed to poverty and dependence.
C．the immigrants had different homeland traditions and other particular characteristics.
D．the immigrants did not speak English.
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