单项选择题

The passage mainly tells us that ______.

A．the increase of human population leads to more destruction of the natural world
B．the decrease of animal population results from the dwindling biodiversity in the natural world
C．the planet's biodiversity is also related to the number of households
D．the planet's biodiversity relies on the balanced increase of larger and smaller households

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单项选择题What are the elements that produce human emotions

A．Some strong uncontrolled forces which trigger emotions.
B．Internal processes such as illnesses, happiness, anger, etc.
C．External happenings such as deaths, divorce, promotions, etc.
D．External environmental events as well as internal mental processes.

单项选择题Why do the researchers try to classify emotions

A．Because they try to place their research on a manageable basis.
B．Because there too many emotions to recognize.
C．Because each emotion represents a different implication.
D．Because there are some secondary emotions.

单项选择题Which of the following statements about emotions is NOT TRUE

A．Emotions are accompanied by some certain behaviors.
B．Emotions are combinations of subjective feelings.
C．Extreme emotional reactions are the features of emotional cognitive thought.
D．Emotional occurrences are also the processes of mental thinking.

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

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