单项选择题

A．We should think on our own when reflecting on the phi……

According to the text, which of the following is true

A．We should think on our own when reflecting on the philosophical problems of the world.
B．We should cooperate with others when reflecting on the philosophical problems of the world.
C．The thoughts and answers of the philosophical problems provided by others will guide us.
D．We should travel around in order to reflect on the philosophical problems of the world.

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单项选择题According to the author, what is the cause for wars

A．The differences of political power.
B．The differences of military power.
C．The differences of the people's nature.
D．The differences of social and political philosophy.

单项选择题What is important for human bodies to renew

A．Evolution.
B．Biological condition.
C．Reproduction.
D．Old age.

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.

单项选择题What can we infer from the text

A．It is easy to prolong the average life span in developed country, because of the advanced health science.
B．It is difficult to prolong the average life span greatly, because science cannot prevent the aging process now.
C．If the diseases that cause most of the death can be cured, the average life span will increase greatly.
D．More and more people will live past 100 if the diseases that cause most of the death can be cured.