Social distance varies from species to species. It is quite shortapparently only a few yardsamong some animals, and quite long among others.

　　Social distance is not always rigidly fixed but is determined in part by the situation. When the young of apes and humans are mobile but not yet under control of the mothers voice, social distance may be the length of her reach. This is readily observed among the baboons in a zoo. When the baby approaches a certain point, the mother reaches out to seize the end of its tail and pull it back to her. When added control is needed because of danger, social distance shrinks. To show this in man, one has only to watch a family with a number of small children holding hands as they cross a busy street.

　　1. Which of the following is the most appropriate definition of Flight Distance?

　　A. Distance between animals of the same species before fleeing.

　　B. Distance between large and small animals before fleeing.

　　C. Distance between an animal and its enemy before fleeing.

　　D. Distance between certain animal species before fleeing.

　　2. If an animals critical distance is penetrated, it will

　　A. begin to attack.

　　B. try to hide.

　　C. begin to jump.

　　D. run away.

　　3. According to the passage, social distance refers to

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