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..
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. |
.
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. |
.
. 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. |
.
. 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 |
The gray-haired lady can’t wait to leave the building to search for her dad. Unless watched, she will walk in the streets in an effort to find her father, who died 30 years ago.
Not all cases of Alzheimer’s disease look like this, but Alzheimer’s is a serious disease that is said to be the fourth or fifth leading cause of death for people over age 75. It is said that about three percent of the U.S. population over age 65 have Alzheimer’s. In the early stages, people may exhibit short-term memory loss. Some may experience changes in personality, easy to be angry. As the disease progresses, patients might lose the ability to move and may be unable to speak or move at all. This progressive disease generally lasts 8 to 10 years before death occurs.
While no one is certain what causes these changes in the brain’s nerve fibers （神经纤维）, their effect is certain. Alzheimer’s destroys not only the patients, but also spouses（配偶）, friends and families.
What should you do if you notice progressive memory loss in yourself or a loved one? Have the person examined by a doctor who is a specialist in the treatment of Alzheimer’s disease. Though many reasons other than Alzheimer’s disease may cause memory loss, its early diagnosis（诊断）and treatment may delay some of the most serious effects.
What feeling will you likely experience if a loved one suffers from Alzheimer’s disease? A person will often go through the various stages of sadness, shock, anger, and so on. If the spouse develops the disease, you may experience hurt and disappointment when he or she doesn’t remember you are married.
Life for the Alzheimer’s patients and their loved ones will never be the same as the disease progresses, bringing a deep sorrow, loss and even anger towards God. No matter what feelings are present, facing them honestly will serve one better than burying them.What can be inferred from the passage about the gray-haired day?
| A．She has been living with her father. |
| B．She was sad about the death of her father. |
| C．She can’t search for her father without being watched. |
| D．She suffers from Alzheimer’s disease. |
When people suffer from Alzheimer’s disease, ________.
| A．their families and friends will suffer from the same disease |
| B．their families and friends will experience mental sufferings |
| C．they will certainly die in 8 to 10 years |
| D．they will forget everybody but their spouses |
Memory loss occurs ________.
| A．from Alzheimer’s disease and nothing else |
| B．from sadness, shock, anger, and so on |
| C．for a number of reasons |
| D．with changes in personality |
From the passage we know that .
| A．early treatment may stop Alzheimer’s disease occurring |
| B．it is still unknown what causes the changes in the brain’s nerve fibers |
| C．nerve fibers in the brain will cause Alzheimer’s disease |
| D．when one suffers from Alzheimer’s disease, he will be buried |
Trees are useful to man in three very important ways: they provide him with wood and other products；they give him shade；and they help to prevent drought and floods.
Unfortunately, in many parts of the world, man has not realized that the third of these services is the most important. In his eagerness to draw quick profit from the trees, he has cut them down in large numbers, only to find that without them he has lost the best friends he had.
Two thousand years ago, a rich and powerful country cut down its trees to build warships, with which to gain itself an empire. It gained the empire but, without its trees, its soil became hard and poor. When the empire fell to pieces, the country found itself faced by floods and starvation.
Even though a government realizes the importance of a plentiful supply of trees, it is difficult for it to persuade the villager to see this. The villager wants wood to cook his food with, and he can earn money by making charcoal(木炭) or selling wood to the townsman（城市居民）. He is usually too lazy or too careless to plant and look after trees. So unless the government has a good system of control, or can educate the people, the forests will slowly disappear.
This does not only mean that the villager’s sons and grandsons have fewer trees. The results are even more serious. For where there are trees their roots break the soil up—allowing the rain to sink in and also hold the soil, thus preventing it being washed away easily, but where there are no trees, the soil becomes hard and poor. The rain falls on hard ground and flows away on the surface, causing floods and carrying away with it the rich topsoil, in which crops grow so well. When all the topsoil is gone, nothing remains but a worthless desert.The purpose that the writer wrote this article is to _________.
| A．tell people the use of wood |
| B．tell people the function of tree roots |
| C．warn that man mustn’t destroy forests any more |
| D．explain how trees help man live a better life. |
In the writer’s opinion, _________, or the forests will slowly disappear.
| A．measures must be taken |
| B．people shouldn’t draw benefit from the tree |
| C．government must realize the serious results |
| D．unless no trees are cut down. |
According to the article we know it is ________ to prevent the forests from slowly disappearing.
| A．necessary but impossible | B．necessary but difficult |
| C．impossible and unimportant | D．difficult and impossible |
In the last two paragraphs the writer wanted to make it clear that _________.
| A．where there are no trees, the soil becomes poor but soft |
| B．where there are many trees, there are more floods |
| C．where there are no trees, the land might become desert slowly |
| D．floods will make the land become desert |
If a person forgets names , places or facts —and has trouble with everyday things like reading or shopping —it may not mean you are getting old . It could be Alzheimer’s disease . So it’s important to see a doctor as soon as you can .
There is no cure for Alzheimer’s . But a drug called ARICEPT has been used by millions of people to help their symptoms (症状).
In studies , ARICEPT has been proved to work for Alzheimer’s . It has helped people improve their memory over time . It has also helped them to keep doing everyday things on their own .
Ask your doctor if ARICEPT is right for you or your loved one . It is the Number One drug for Alzheimer’s in the world . The sooner you know it’s Alzheimer’s , the better ARICEPT can help .
ARICEPT is good for many but may not be good for everyone . Some people may experience not sleeping well , feeling very tired , or not wanting to eat . In studies , these side effects weren’t serious at all and went away over time . Some people taking ARICEPT may feel light-headed . In this case you should tell your doctors because your condition may get worse .If one suffers from Alzheimer’s , .
| A．he can’t do everyday things on his own |
| B．he has trouble with his memory |
| C．he often forgets things because he is old |
| D．he can’t move about |
What is ARICEPT ?
| A．A medicine to cure Alzheimer’s |
| B．A medicine to delay signs of aging . |
| C．A medicine to cure brain damage . |
| D．A medicine to reduce the symptoms of Alzheimer’s . |
One who is taking ARICEPT should go to see a doctor if he .
| A．feels like a drunken man | B．feels tired out |
| C．has no desire to eat | D．can’t fall asleep |
In July 1994 Jupiter, the largest planet in our solar system, was struck by 21 pieces of a comet（彗星）. When the fragment（碎片）landed in the southern part of the giant planet, the explosions were watched by scientists here on earth. But what if our own planet was hit by a comet?
The year is 2094. It has been announced that a comet is heading towards the Earth. Most of it will miss our planet, but two fragments will probably hit the southern part of the Earth. The news has caused panic.
On 17 July, a fragment four kilometers wide enters the Earth’s atmosphere with a huge explosion. About half of the fragment is destroyed. But the major part survives and hits the South Atlantic at 200 times the speed of sound. The sea boils and an enormous wave is created and spreads. The wall of water rushes towards southern Africa at 800 kilometers an hour. Cities on the African coast are totally destroyed and millions of people are drowned. The wave moves into the Indian Ocean and heads towards Asia.
Millions of people are already dead in the southern part of the Earth, but the north won’t escape for long. Tons of broken pieces are thrown into the atmosphere by the explosions. As the sun is hidden by clouds of dust, temperatures around the world fall to almost zero. Crops are ruined. Wars break out as countries fight for food. A year later civilization has collapsed. No more than 10 million people have survived.
Could it really happen? In fact, it has already happened more than once in the history of the Earth. The dinosaurs（恐龙）were on the Earth for over 160 million years. Then 65 million years ago they suddenly disappeared. Many scientists believe that the Earth was hit by a space fragment. The dinosaurs couldn’t survive in the cold climate that followed and they became extinct. Will we meet the same end? Which of the following is NOT TRUE according to the author’s description of the disaster in 2094?
The whole mankind becomes extinct.
All the coastal cities in African are destroyed.
The whole world becomes extremely cold.
The visit of the comet results in wars.Why does the author mention dinosaurs at the end of the passage?
| A．Because they could only live in the warm climate. |
| B．Because they once dominated the Earth. |
| C．Because dinosaurs and humans never live in the same age. |
| D．Because their extinction indicates future disasters |
In writing the passage, the author intends to __________.
| A．give an accurate description of the possible disaster in the future |
| B．warn of a possible disaster in the future |
| C．tell the historical development of the Earth |
| D．prove that humans will sooner or later be destroyed |
It can be concluded that the passage is most probably part of a(n) __________.
| A．horror story | B．news report |
| C．article of popular science | D．research paper |
When I was six, Dad brought home a dog one day, who was called “Brownie”. My brothers and I all loved Brownie and did different things with her. One of us would walk her, another would feed her, then there were baths, playing catch and many other games. Brownie, in return, loved each and every one of us. One thing that most touched my heart was that she would go to whoever was sick and just be with them . We always felt better when she was around.
One day, as I was getting her food, she chewed up(咬破)one of Dad’s shoes, which had to be thrown away in the end. I knew Dad would be mad and I had to let her know what she did was wrong. When I looked at her and said, ”Bad girl,” she looked down at the ground and then went and hid. I saw a tear in her eyes.
Brownie turned out to be more than just our family pet, she went everywhere with us .People would stop and ask if they could pet her. Of course she’d let anyone pet her. She was just the most lovable dog. There were many times when we’d be out walking and a small child would come over and pull on her hair. She never barked(吠) or tried to get away. Funny thing is she would smile. This frightened people because they thought she was showing her teeth. Far from the truth, she loved everyone.
Now many years have passed since Brownie died of old age. I still miss the days when she was with us. What would Brownie do when someone was ill in the family?
| A．Look at them sadly. | B．Touch them gently. |
| C．Play games with them. | D．Keep them company. |
We can infer from Paragraph 2 that Brownie__________.
| A．would eat anything when hungry | B．loved playing hide-and-seek |
| C．felt sorry for her mistake | D．disliked the author’s dad |
Why does the author say that Brownie was more than just a family pet?
| A．She was loved by everybody she met. | B．She played games with anyone she liked. |
| C． She was treated as a member of the family. | D．She went everywhere with the family. |
Which of the following best describes Brownie?
| A．Shy | B．Polite | C．Caring | D．Brave |