单项选择题

The passage indicates that individual emotions ______.

A．vary from person to person
B．follow more or less the same patterns
C．keep changing inconsistently
D．are genetically inherited
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单项选择题
The two examples given in the third paragraph shows that ______.
A．emotions are the results of physiological reactions based on external events
B．excitement and fear are commonly seen human emotions
C．physiological changes determine all human actions
D．environmental occurrences are related with mental thinking
单项选择题
Some environmentalists warn that the soaring population will cause ______.
A．the degradation of people's living standard in the next century
B．the deterioration of living environment in the next century
C．the reproduction of more wild species in the next century
D．the extinction of more wild species in the next century
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