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 term 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’s(壁虎) flight distance, on the other hand, is about six feet. Flight is the basic means of survival for mobile creatures.

　 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(进入) the lion's critical distance, at which point the cornered lion turns back and begins slowly to stalk (逼近) the man.

　 Social animals need to stay in touch with each other. Loss of contact with the group can be fatal(致命的) 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 it goes beyond its limits.

Social distance is not always rigidly(刻板的) 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's voice, social distance may be the length of her reach. When added control is needed because of danger, social distance shortens. 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 correct explanation of “Flight Distance” in paragraph 1?

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 a lion’s critical distance is penetrated, it will __________.

A. begin to attack.

B. try to hide.

C. begin to jump.

D. run away.

3..

. The example of “children holding hands when crossing the street” in the last paragraph shows that ________.

A. social distance is not always needed.

B. there is no social distance among small children.

C. humans are different from animals in social distance.

D. social distance is sometimes determined by outside factors.

4..

. Which of the following can be the best title of the passage?

   A. Critical Distance

   B. Social Distance

   C. Relationship Between Animals

D. Spacing in Animals

阅读理解

　　A close friend of mine lives with six hundred wildlife on the Greek Island of Kyklos. Ever since he left school(where I first knew him), he has travelled all over the world collecting animals for his very own zoo. He hoped to collect at least two examples of every kind of animal on his island, like Noah before the Great Flood. But the flood that my friend was afraid of, was a flood not of water, but of people, I expect you have heard of my friend, he writes books about his travells, and about the wild and wonderful animals that he collects. The money from the books helps to pay for all the food that these animals eat.

　　My friend told me that when he was out looking for water last week, (there is not enough water on the island, though there is plenty all round it), he found oil. He needs money for his travells, and for his zoo, and a little oil would buy enough water for a life-time, but he knows that if he tells anybody else about it, it will be the end of his zoo and his life’s work.

　　So, he will not tell anybody (but you and me) about what he found, because oil and water do not mix.

1．The writer got to know his friend ________.

[　　]

A．on the island where his friend’s zoo is

B．at the school where they studied

C．at a certain place while his friend was travelling

D．at the place where his friend found oil

2．My friend has travelled all over the world ________ for his zoo.

[　　]

3．Last week my friend ________.

[　　]

A．found plenty of oil all round the island

B．was looking for water but found oil instead

C．found enough water on his island to last a life-time

D．went out looking for a job

4．In this text,“oil and water do not mix.”means ________.

[　　]

A．you can’t sell oil for water

B．oil and water can’t be mixed together

C．if you want to get the oil, you will lose all animals

D．my friend doesn’t need oil but water

When did you last see a polar bear(北极熊）? On a trip to a zoo,perhaps?  If you had attended a winter activity in New York a few years ago,  you would have seen a whole polar bear club.  These "Polar Bears" are people who meet frequently in the winter to swim in freezing cold water.  That day, the air temperature was 3℃, and the water temperature was a little higher.  The members of the Polar Bear Club at Coney Island, New York are usually about the age of 60.  Members must satisfy two requirements.  First, they must get along well with everyone else in the group; this is very important because there are so many different kinds of people in the club.  Polar Bears must also agree to swim outdoors at least twice a month from November through February.
Doctors don't agree about the medical effects of cold-winter swimming.  Some are worried about the dangers of a condition in which the body's temperature drops so low that finally the heart stops.  Other doctors, however, point out that there is more danger of a heart attack during summer swimming because the difference between the air temperature and water temperature is much greater in summer than in winter.
The Polar Bears themselves are satisfied with the benefits of cold-water swimming.  They say that their favorite form of exercise is very good for the circulatory system(循环系统）because it forces the blood to move fast to keep the body warm.  Cold-water swimmers usually turn bright red after a few minutes in the water.  A person who turns blue probably has a very poor circulatory system and should not try cold-water swimming.
　　The main benefits of cold-water swimming are probably mental.The Polar Bears love to swim all year round;  they find it fun and relaxing.  As one 70-year-old woman says,"When I go into water, I pour my troubles into the ocean and let them float away."
【小题1】The members of the Polar Bear Club must meet the following requirements except that_____.

A．they must swim outdoors at least 8 times in the four cold months

B．they must reach the age of 60

C．they should be easy to make friends with

D．they must agree to swim outdoors from November through February

A．Polar Bears are bears swimming in freezing water

B．cold-water swimming can make the body temperature dangerously high

C．you are healthy if cold-water swimming turns your skin color blue

D．cold-water swimming causes more heart attacks in summer than in winter

　　When did you last see a polar bear? On a trip to a zoo, perhaps? If you had attended a winter activity in New York a few years ago, you would have seen a whole polar bear club. These "Polar Bears" are people who meet frequently in the winter to swim in freezing cold water. That day, the air temperature was 3℃, and the water temperature was a bit higher. The members of the Polar Bear Club at Coney Island, New York are usually about the age of 60. Members must satisfy two requirements. First, they must get along well with everyone else in the group, this is very important because there are so many different kinds of people in the club. Polar Bears must also agree to swim outdoors at least twice a month from November through February.
　　Doctors do not agree about the medical effects of cold-water swimming. Some are worried about the dangers of a condition in which the body's temperature drops so low that finally the heart stops. Other doctors, however, point out that there is more danger of a heart attack during summer swimming because the difference between the air temperature and water temperature is much greater in summer than in winter.
The Polar Bears themselves are satisfied with the benefits (or advantages) of cold-water swimming. They say that their favorite form of exercise is very good for the circulatory system(循环系统) because it forces the blood to move fast to keep the body warm. Cold-water swimmers usually turn bright red after a few minutes in the water. A person who turns blue probably has a very poor circulatory system and should not try cold-water swimming.
　　The main benefits(or advantages) of cold-water swimming are probably mental. The Polar Bears love to swim year-round; they find it fun and relaxing. As one 70-year-old woman says. "When I go into the water, I pour my troubles into the ocean and let them float away."
51. The members of the Polar Bear Club must meet the following requirements except that_____ .
　A. they should be easy to make friends with
　B. they must swim outdoors at least 8 times in the four cold months
　C. they must agree to swim outdoors from November through February
　D. they must reach the age of 60
52. Doctors _____ .
　A. encourage people to take part in cold-water swimming actively
　B. point out the possible danger of blood illness during cold-water swimming
　C. believe swimming is helpful both in winter and in summer
　D. have different ideas about the medical effects of cold-water swimming
53. According to the passage, some doctors believe it is true that _____ .
　A. you are healthy if cold-water swimming turns your skin color blue
　B. cold-water swimming causes more heart attacks in summer than in winter
　C. cold-water swimming can make the body temperature dangerously high
　D. Polar Bears are bears swimming in freezing water
54. The Polar Bears like to swim all the year round, for _____ .
　A. they can remain young   B. it is an easy way to keep the body warm in winter
　C. they find it enjoyable and interesting D. they might meet fewer troubles in life
55. The passage is mainly about _____ .
a group of cold-water swimming lovers                  B. the polar bears' life  
　C. doctors' ideas about cold-water swimming            D. the requirements of the Polar Bear Club

When did you last see a polar bear? On a trip to a zoo, perhaps? If you had attended a winter activity in New York a few years ago, you would have seen a whole polar bear club. These "Polar Bears" are people who meet frequently in the winter to swim in freezing cold water. That day, the air temperature was 3℃, and the water temperature was a bit higher. The members of the Polar Bear Club at Coney Island, New York are usually about the age of 60. Members must satisfy two requirements. First, they must get along well with everyone else in the group. This is very important because there are so many different kinds of people in the club. Polar Bears must also agree to swim outdoors at least twice a month from November through February.

　　Doctors do not agree about the medical effects of cold-water swimming. Some are worried about the dangers of a condition in which the body's temperature drops so low that finally the heart stops. Other doctors, however, point out that there is more danger of a heart attack during summer swimming because the difference between the air temperature and water temperature is much greater in summer than in winter.

The Polar Bears themselves are satisfied with the benefits (or advantages) of cold-water swimming. They say that their favorite form of exercise is very good for the circulatory system（循环系统）because it forces the blood to move fast to keep the body warm. Cold-water swimmers usually turn bright red after a few minutes in the water. A person who turns blue probably has a very poor circulatory system and should not try cold-water swimming.

　　The main benefits (or advantages) of cold-water swimming are probably mental. The Polar Bears love to swim year-round; they find it fun and relaxing. As one 70-year-old woman says. "When I go into the water, I pour my troubles into the ocean and let them float away."

The members of the Polar Bear Club must meet the following requirements except that

__________.

A. they must reach the age of 60

B. they should be easy to make friends with

C. they must swim outdoors at least 8 times in the four cold months

　 D. they must agree to swim outdoors from November through February

Doctors __________.

A. encourage people to take part in cold-water swimming actively

　 B. point out the possible danger of blood illness during cold-water swimming

　 C. believe swimming is helpful both in winter and in summer

　 D. have different ideas about the medical effects of cold-water swimming

According to the passage, some doctors believe it is true that __________.

　 A. you are healthy if cold-water swimming turns your skin color blue

　 B. cold-water swimming causes more heart attacks in summer than in winter

　 C. cold-water swimming can make the body temperature dangerously high

　 D. Polar Bears are bears swimming in freezing water

The Polar Bears like to swim all the year round, for __________.

　 A. they can remain young                         B. it is an easy way to keep the body warm in winter

　 C. they find it enjoyable and interesting        D. they might meet fewer troubles in life

The passage is mainly about __________.

A. a group of cold-water swimming lovers              

B. the polar bears' life 

　 C. doctors' ideas about cold-water swimming              

D. the requirements of the Polar Bear Club