There is no doubt that man is a member of the animal kingdom.Anyone who has thought about this fact seriously must have wondered how it has come about that man has achieved a position so supreme（最高的） among the myriad kinds of animal life.Two characteristics of man,in comparison with all other animals,that stand out above all others are the creation and use of tools and the development and use of language.Since no other animals have achieved these abil

There is no doubt that man is a member of the animal kingdom.Anyone who has thought about this fact seriously must have wondered how it has come about that man has achieved a position so supreme（最高的） among the myriad kinds of animal life.Two characteristics of man,in comparison with all other animals,that stand out above all others are the creation and use of tools and the development and use of language.Since no other animals have achieved these abilities,it must be assumed that man's evolutionary development led to his capacity to create and use tools and to devise and use language.
Once these abilities and practices evolved,they probably became driving forces in the further evolution of man.Those members of the species who become most proficient(精通的) in the fabrication of tools and in the command of language and thought would tend to survive and maintain their kind for good,at the expense of those of lesser ability.
Which of the following statements best expresses the main idea of the passage?
Tools and language are either the effects or the causes of human evolution.
No other animals have achieved human abilities.
Among the animals,only man is able to use tools and language.
Man owns his capacity to making use of tools and language.
"Animal kingdom" in the passage refers to _____ .
the place where all animals live
the animal society
all kinds of animals,including man
the forest with animals
One important condition for man's evolution is _____ .
the animal kingdom
a supreme position
the myriad kinds
his natural capacity
The phrase "come about" in the passage is likely to mean ________.
happened
appeared
arrived
succeeded
The last sentence suggests that ____ .
those of lesser ability would be very expensive
in order to survive,man has to sacrifice some other animals
those who become proficient in making tools can speak well
language and thought could be acquired by man
急