Scientists from England’s Newcastle University have discovered that bacteria have the ability to detect smells, according to a study by the university on Sunday.
The team of scientists, led by Dr. Reindert Nijland, discovered that bacteria can detect certain types of smell- producing chemicals, including ammonia (氨) that is produced by other bacteria. Once they sense the smells from other kinds of bacteria, the bacteria will gather together to form a colony (集群) and form a layer of slime (粘液) in order to force the competitors out of their area. The response decreases as the distance between the two bacterial colonies increases.
That slime, also known as biofilm, is one of the primary causes of infection on many medical implants(移植物). Biofilms also slow down ships and are believed to cost the marine industry millions of dollars annually. However, they can also be used to clean up spilled oil floating on the sea, as they grow strong on it.
“This is the first evidence of a bacterial ‘nose’able to detect potential competitors,” Dr. Nijland said in the August 15 statement, which confirms that bacteria possess qualities similar to four of the five senses that humans enjoy (sight, hearing, touch, taste, and smell), the others being touch, taste, and sight.
“The fact that bacteria formed slime when exposed to ammonia has important significance for understanding how biofilms are formed and how we might be able to use them to our advantage,” he added.
Their findings were published in Sunday’s edition of biotechnology journal, and could change the way scientists look at how each of the senses developed over time.
“It was thought for a long time that smell existed only in complex living creatures,” Dr. Nijland said. “Now we see that bacteria are able to do the same, so the indication is that the ability may have developed even earlier.”We learn from the text that biofilms _____.
| A．may cause oil to spill |
| B．can be used to benefit humans |
| C．are the major causes of infection |
| D．are more likely to be found on ships |
Which of the following describes bacteria correctly?
| A．They can talk. |
| B．They cannot see |
| C．They cannot hear. |
| D．They can imitate others. |
The findings may help scientists know more about ______.
| A．how bacteria reproduce |
| B．the development of the senses. |
| C．how to control bacterial infection. |
| D．the complex relation of living creatures |
Which of the following would be the best title for the text?
| A．Bacteria can produce ammonia |
| B．Bacteria have a sense of smell |
| C．Why are biofilms so annoying? |
| D．How do bacteria communicate? |
The South China tiger could become extinct within 30 to 50 years if it does not receive protection. There are only 20 to 30 South China tigers in their earliest natural places, with Guangdong Province having only five left because forests are being destroyed as a result of rapid industrial growth.
The South China tiger can live 20 to 25 years, but the survival rate for the young is becoming lower as a result of rapid growth in industry and tourism. Even with hard work, it is hoped that the number of South China tigers can only reach 150 to 180 in the coming century.
68. The underlined word “extinct ” means ______.
A. different B. seriously ill C. no longer exist D. frightening
69. The best title for this news could be ______.
A. The Life Span of the South China Tiger
B. The Coming Century for the South China Tiger
C. Chinese Scientists Call SOS for South China Tigers
D. Industrial Growth—The Enemy of South China Tiger
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 show 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 symptoms and treatment may delay some of the most serious effects.
What feeling will you likely experience should a loved one suffer 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.
64. What can be inferred from the passage about the gray-haired lady?
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.
65. 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
66. 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
67. 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
第三部分：阅读理解（第一节15小题，第二节５小题；每小题２分，满分4０分）
第一节：阅读下面的短文，从每题所给的四个选项(A、B、C和D)中，选出最佳选项，并在答题卡上将该项涂黑。
Parents often believe that they have a good relationship with their teenagers. But last summer, Joanna and Henry noticed a change in their older son: suddenly he seemed to be talking far more to his friends than to his parents. “The door to his room is always shut.” Joanna noted.
Tina and Mark noticed similar changes in their 14-year-old daughter. “She used to cuddle up (蜷伏) with me on the sofa and talk,” said Mark. “Now we joke that she does this only when she wants something. Sometimes she wants to be treated like a little girl and sometimes like a young lady. The problem is figuring out which time is which.”
Before age 11, children like to tell their parents what’s on their minds. “In fact, parents are first on the list.” said Michael Riera, author of Uncommon Sense for Pare
nts with Teenagers. “This completely changes during the teen years.” Riera explained. “They talk to their friends first, then maybe their teachers, and their parents last.”
Parents who know what’s going on in their teenagers’ lives are in the best position to help them. To break down the wall of silence, parents should create chances to understand
what their children want to say, and try to find ways to talk and write to them. And they must give their children a mental break, for children also need freedom, though young. Another thing parents should remember is that, to be a friend, not a manager, with their children is a better way to know them.
61. “The door to his room is always shut” suggests that the son _______.
A. is always busy with his studies
B. doesn’t want to be disturbed (干扰)
C. keeps himself away from his parents
D. begins to dislike his parents
62. What troubles Tina and Mark most is that ______.
A. their daughter isn’t as lovely as before
B. they can’t read their
daughter’s mind exactly
C. they don’t know what to say to their daughter
D. their daughter talks with them only when she needs help
63. Which of the following best explains “the wall of silence” in the last paragraph?
A. Teenagers talk a lot with their friends.
B. Teenagers do not want to understand their parents.
C. Teenagers do not talk much with their parents.
D. teenagers talk little about their own lives.
When an ant dies, other ants take it out of the nest, often within an hour after its death. This behavior interests scientists and they wonder how ants know for sure—and so soon—that another ant is dead.
One scientist recently came up with a way to explain this ant behaviour. Dong-Hwan Choe is a biologist, a scientist who studies animals and plants. He found that ants have a chemical on the outside of their bodies that signals to other ants, “I'm dead—take me away” when it is dead.
But there's a question to answer: As we know, if an ant is dead, it stops moving. But when an ant is sleeping or knocked unconscious, it is also not moving. However, other ants don't move the living ant out of the nest. How do they know this ant is not dead? Choe found that ants have another chemical on their bodies, which tells nearby ants something like
, “Wait—I'm not dead yet”when 
it is not dead. Choe suspects that when an ant dies, the chemical that says, “Wait I'm not dead yet”quickly goes away. When other ants detect the“dead”chemical without the“not dead yet”chemical, they move away the body.
To test his theory , Choe and his team put different chemicals on ants. When the scientists used the “I'm dead” chemical, other ants quickly moved the treated ant away. When the scientists used the“Wait—I'm not dead yet”chemical, other ants left the treated ant alone. Choe believes this behavior shows that the“not dead yet”chemical overrides the“dead” chemical when picked up by other ants. And that when an ant dies, the “not dead yet” chemical fades away. Other nearby ants then detect the remaining“dead”chemical and remove the body from the nest.
Understanding this behavior can help scientists figure out how to stop ants 
from invading new places and causing problems.
57. What is the function of the first paragraph?
A. Leading the following paragraphs.
B. Showing the main idea of the passage.
C. Introducing the background of the passage.
D. Giving a summary of the passage.
58. Which of the following has the closest meaning to the underlined word “overrides” in the fourth paragraph?
A.is weaker than B. is stronger than C. is better than D. is worse than
59. What can we learn from the passage?
A. Living ants can also be taken away when they are not moving.
B. When an ant dies, it can tell others using a certain chemical.
C. A living ant can pretend to be dead using a special chemical.
D. Ants often use chemicals to communicate with each other.
60. Which of the following descriptions about Dong-Hwan Choe is right?
A. Choe did this study in order to stop ants from invading new places.
B.
Choe is a biologist who is only interested in animals, especially in ants.
C. Choe first came up with an idea to explain this ant behavior，and then did some tests to prove his theory.
D. Choe did the research on this ant behavior on his own
COPENHAGEN—The world is gathered in Copenhagen for the U.N. climate summit, but Denmark’s bicycle-friendly capital has also given its name to a movement of cities trying to find a kinder way to travel to and from work.
Nearly 40 percent of Copenhagen’s population cycle to work or school on ubiquitous（无处不在的） paved cycle paths. Many residents take to their bikes year-round, braving rain and snow through the winter in a city where the bicycles outnumber the people.
Amsterdam and Beijing too are known for their bicycles, but the Danish capital is where urban planners from around the world have been looking for ways to get their people out of cars and up onto bikes, an effort known as Copenhagenisation.
Klaus Bondam, Copenhagen’s technical and environmental chief, calls himself a “mega cyclist” and says the bike’s popularity stems partly from high taxes on cars which meant working-class Danes could not afford to drive in the 1930s and 1940s. “Today you’ll meet everybody on the bicycle lanes — women and men, rich and poor, old and young.” Bondam said.
The local government has during the last three years invested more than 250 million crowns ($49.42 million) in bicycle lanes and to make the traffic safer for bicyclists. Today around a third of the population drive cars to work or study, another third take public transport, while 37 percent cycle -- a figure the city aims to increase to 50 percent by 2015.
There are many benefits when citizens choose bicycles over cars: pollution and noise decline, public health improves, and more people on bikes or walking creates a sense of safety in the city. Fewer parked cars leaves more space for playgrounds, parks, shopping areas and other useful public places.
53. According to the first paragraph, Copenhagen is better known as ___________.
A. a city without cars B. a bicycle-friendly city
C. Denmark’s capital D. the U.N. climate summit
54. We can learn from the second and the third paragraph, __________.
A. there is no path for cars during rainy and snowy days
B. citizens are limited to have only one bike for each person
C. two-thirds of people in Copenhagen cycle to work or school
D. city planners try their best to encourage more citizens to ride bikes
55. Bikes are popular in Copenhagen partly because ___________.
A. the citizens are unable to afford to buy a car
B. the rich tend to keep fit by cycling to work
C. young people regard cycling a fashion to follow
D. high taxes were paid for cars in the 1930s and 1940s
56. We can learn from the passage that __________.
A. cars are forbidden to park in Copenhagen
B. more citizens tend to choose cars in Copenhagen
C. Copenhagen becomes a model for cities’ traffic
D. living standards in Copenhagen are greatly declining
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