题目内容
（请给出正确答案）
A.The cause of her health problem.
B.The importance of physical exercise.
C.The necessity of staying attentive in class.
D.The bad effects &working a computer.
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Spacing in Animals
Flight Distance
Any observant person has noticed that a wild animal will allow a man or other potential enemy to approach only up to a given distance before it flees. "Flight distance" is the terms used for this interspecies spacing. As a general rule, there is a positive relationship between the size of an animal and its flight distance- the larger the animal, the greater the distance it must keep between itself and the enemy. An antelope will flee when the enemy is as much as five hundred yards away. The wall lizard&39;s flight distance, on the other hand is about six feet. Flight is the basic means of survival for mobile creatures.
Critical Distance
Critical distance apparently is present wherever and whenever there is a flight reaction.
"Critical distance" includes the narrow zone separating flight distance from attack distance. A lion in a zoo will flee from an approaching man until it meets a barrier that it cannot overcome. If the man continues the approach, he soon penetrates the lion&39;s critical distance, at which point the cornered lion reverses direction and begins slowly to stalk the man. Social Distance
Social animals need to stay in touch with each other. Loss of contact with the group can be fatal for a variety of reasons including exposure to enemies. Social distance is not simply the
distance at which an animal will lose contact with his group--that is, the distance at which it can no longer see, hear, or smell the group- it is rather a psychological distance, one at which the animal apparently begins to feel anxious when he exceeds its limits. We can think of it as a hidden band that contains the group.
Social distance varies from species to species. It is quite short--apparently only a few yards--among 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 mother&39;s 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.
Which of the following is the most appropriate definition of Flight Distance？ 查看材料
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
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| I always remembered the first time I took part in an English composition competition. "Right! Dean would be the __11__ of our class to participate in the English composition competition," my classmates said. I was too __12__ to speak when I heard what my classmates said. In order not to __13__ short of my classmates'__14__, I trained myself very hard for the hope of being the __15__ of the competition, which would take place a month later. I __16__ a lot of vocabulary, sentence structures and __17__ rules and read many good or renowned articles. Not having I __18__ pretty well, the day came. Every candidate __19__ me looked so wellprepared and __20__. "Only 1. 5 hours. Start," a supervisor suddenly said. Seeing the __21__ "What do most teenagers concern nowadays？" I was nervous and got __22__ block. What's worse, other candidates had begun writing. Moments later, I __23__ myself, took a deep breath, and began brainstorming ideas __24__ the topic. I quickly wrote down the composition structure, central theme, and __25__ necessary elements. As the finishing time was __26__, I tried my best to accelerate my writing. Unfortunately, __27__ my failure of time management, I left my composition incomplete. My final draft looked like a robot __28__ legs were broken. The result came out two weeks later. To my surprise, I got the second prize! All my classmates cheered for me. This encouraged me a lot. __29__ I was not the first prize winner, I could still __30__ pride and happiness spreading around me. | ||||
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