单项选择题

According to Plato ,philosophy is originated from

A．thinking and questioning about various phenomena occurred.
B．the dread of disasters.
C．the origin of human being.
D．the development of advanced technology.

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单项选择题

In what ways human beings are different from other animals

A．Human beings are concerned with their origins.
B．Human beings can think and value.
C．Human beings can distinguish good from evil.
D．Human beings have evolved over long time.

单项选择题

What Olshansky and his team member discovered shows that

A．it is possible for the average life span to increase to 120 years, if death rates are reduced.
B．the average human life span will increase a little, if the death rates are reduced.
C．the upper limits of life bears no relation with the change of death rates,
D．the average human life span will increase a lot, if no one died before reaching age 50.

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