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
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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
单项选择题
The example in paragraph 8 indicated that ______.
A．the local people do not mind conserving the natural environment
B．the local people should further control the rise of population
C．the increase of local population led to the decrease of biodiversity
D．the increase of individual households led to the decrease of biodiversity
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