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.
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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
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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