The fiddler crab (蟹) is a living clock. It shows the time of day by the colour of its skin, which is dark by day and pale by night. The crab’s changing colour follows a regular twenty—four hour plan that exactly matches the daily rhythm of the sun.
Does the crab actually keep time, or does its skin simply answer to the sun’s rays, changing colour according to the amount of light strikes it? To find out, biologists kept crabs in a dark room for two months. Even without daylight, the crab’s skin colour continued to change exactly on time.
This characteristic probably developed gradually in answer to the daily rising and setting of the sun, to help protect the crab from sunlight and enemies. After millions of years it has become completely regulated (受控制) inside the living body of the crab.
The biologists noticed that once each day th
e colour of the fiddler crab is especially dark, and that each day this happens fifty minutes later than on the day before. Fro
m this they discovered that each crab follows not only the rhythm of the sun but also that of the tides (潮水). The crab’s period of greatest darkening is exactly the time of low tide on the beach where it was caught!The fiddler crab is like a clock because it changes colour ______.
A in a regular 24—hour rhythm B. in answer to the sun’s rays
C.
at low tide D. every fifty minutesThe crab’s changing colour ______.
| A．tells the crab what time it is | B．protects the crab from the sunlight and enemies |
| C．keeps the crab warm | D．is of no real use |
When the fiddler crabs were kept in the dark , they ______.
| A．did not change colour | B．changed colour more quickly |
| C．changed colour more slowly | D．changed colour on the same timetable |
The crab’s colour—changing ability was probably developed ______.
| A．in the process of evolution (进化) | B．over millions of years |
| C．by the work of biologists | D．both A and B |
The best title for this selection would be ______.
| A．The Sun and the Tides | B．Discoveries in Biology |
| C．A scientific Study | D．A Living Clock |
Zoos divide opinion ： there are those who think it is cruel to keep animals locked up while others believe zoos are essential for the survival of endangered species.
To argue that zoos imprison animals is to misunderstand what zoos are about. Without zoos many of the creatures we love and admire would no longer exist. Every single day，over one hundred animal species vanish. Scientists predict that as early as 2050 one quarter of the Earth’s species will become extinct.
Some animals are in danger because they are hunted. Alarmingly, the population of tigers has already fallen by ninety-five percent. Other species are in danger because of a lack of food. For example, there are fewer than 1300 giant pandas left in the wild.
Zoos have special breeding programmes to help those animals at risk. These breeding programmes are proving extremely successful. As Irene Shapiro from Zoo and Wildlife Support says, “the Puerto Rican Parrot has grown in numbers from just thirteen to about eighty-five and the Golden Lion Tamarin Monkey, which has almost ceased to exist twenty years ago, has been reintroduced back into the wild. ”
Unfortunately, not everyone understands this important role zoos play. For example, Brian Featherstone from the Anti-Zoo Forum says, “I can’t believe we take animals from the wild and put them in cages for the entertainment of the public! We should view them on film or TV in their natural environment.，’
However, this misses the point. A zoo does more than display animals to the public. It ensures their survival. Without zoos you would not be able to see many of these animals on TV or anywhere else!What’s the writer’s attitude towards zoos?
| A．He shows no opinion either for or against them. |
| B．He thinks that they are unnecessary and cruel. |
| C．He believes they play an important environmental role. |
| D．He expresses a desire that more of them be built. |
The underlined word “vanish” in Paragraph 2 most probably means _____.
| A．remain | B．disappear | C．become rarer | D．get killed |
According to the passage the world’s tiger population _____.
| A．will rise by 5% next year | B．is relatively stable |
| C．is 95% smaller than in the past | D．has fallen to 95% |
According to the passage some people do not agree with zoos because they _____
| A．are too expensive to run | B．put animals in danger |
| C．do not provide enough food | D．keep animals locked up |
According to the writer ，the most important function of the zoo is to _____.
| A．make a lot of money | B．entertain visitors |
| C．ensure animals’ survival | D．educate the public |
As is known to us all, baths and bathing have long been considered of medical importance to man. In Greece there are the ruins of a water system for baths built over 3,000 years ago. The Romans had warm public baths. In some baths, as many 3,000 persons could bathe at the same time.
Treating disease by taking bathing has been popular for centuries. Modern medical bathing first became popular in Europe and by the late1700’s has also become popular in theUnited States.
For many years frequent(经常的) bathing was believed to be bad for one’s health. Ordinary bathing just to keep clean was avoided, and perfume was often used to cover up body smells!
By the1700’s doctors began to say that soap and water were good for health. They believed that it was good for people to be clean. Slowly, people began to bathe more frequently. During the Victorian Age of the late 19th century, taking a bath on Saturday night became common.
In theUnited Statesordinary bathing was slow to become popular. During the 18th and early 19th centuries, many Americans were known as “The Great Unwashed!” In one American city, for example, a person was only allowed to take a bathe every thirty days! That was a law!
Frequency of bathing today is partly a matter of habit. People know that bathing for cleanliness is important to health, Doctors know that dirty bodies increase the chance of diseases. As a result, in theUnited States, people generally bathe often. Some people bath once a day at least. They consider a daily bath essential (="necessary)" to good health. A water system for baths was built by_________over 3,000 years ago.
| A．the Greeks | B．the Romans | C．the Americans | D．the Europeans |
In the 18th century doctors believed that being clean was__________.
| A．good for health | B．unimportant | C．harmful | D．important |
The underlined word perfume probably means_____________.
| A．a strange smelling substance | B．good health |
| C．a sweet smelling substance | D．large wealth |
Whichof the following gives the main idea of the passage?
| A．Everybody inAmericatakes a daily bath. |
| B．A bath a day keeps the doctor away. |
| C．Bathing has become easier and cheaper. |
| D．Taking baths has become popular in the world. |
Who says constant texting is just a bad habit? The teenager with the fastest thumbs in the country was crowned on Wednesday at the LG US National Texting Championship in New York City, winning ＄50,000 after a series of fierce texting battles.
16-year-old Austin Wiershke comes from Rhinelander, Wisconsin of the United States. He took home the top prize at the fifth annual texting event, beating 11 other competitors in the final, including last year’s champion Brianna Hendrickson from Brooklyn, New York.
Wiershke, who was wearing a gray shirt and having Justin Bieber’s hairstyle, sailed through each level of the competition by typing passages of text on a QWERTY keyboard rapidly without any mistaken. One special round even included being blindfolded(蒙眼) on the state to make up phrases by memory.
“I’m extremely nervous,” Wiershke said while waiting for the results after the final round. “I’m getting ready to hear Brianna’s name. When I heard my name was announced, I really couldn’t believe my ears.” After the announcement was made, confetti(五彩纸屑) dropped from the ceiling and Wiershke was met on the stage by the singer who said that she liked texting very much. She was Ashley Tisdale, a famous and beautiful singer, who awarded him his check.
In August, a film on Music Television called “Thumbs” took a behind-the –scenes look at the teenager’s life. It shows how he practiced texting to be the fastest. The film followed a series of young texting competitors, including Brianna Hendrickson, in the weeks leading up to this year’s LG US National Texting Championship. Besides showing the always –connected lifestyle of these teenagers nationwide, the mover also shows the studies, sports , dreams and friendships among these competitors.What is the main idea of this passage?
| A．A teenager receiver $50,000. |
| B．Teenagers in the US make money by texting. |
| C．A teenager was named the fastest texter in the US. |
| D．The LG US National Texting Championship was held in New York City. |
During the special round, competitors were required to text_____________.
| A．among confetti |
| B．without using their eyes |
| C．using a special keyboard |
| D．extremely difficult words |
We can infer that Austin Wiershke_________.
| A．wasn’t used to using the QWERTY keyboard |
| B．didn’t think Brianna Hendrickson would win this time |
| C．didn’t expect he would beat Brianna Hendrickson |
| D．was very confident when he was waiting for the result of the contest |
Through the film called “Thumb”, people can know____________.
| A．the development of the LG US National Texting Championship |
| B．various parts of the competitors’ life |
| C．what happened to the competitors after the contest |
| D．the details of the texting contest |
Hearing plays an important part in our everyday life, but few of us take the steps we need to protect our hearing.
It is easy to see how your hearing is under assault in today’s world. There are so many things to hear, and so many new instruments, like iPods and headphones, which can harm your hearing if used improperly. Keeping the volume(音量)to a reasonable level on an iPod or other portable listening instruments is one of the most important ways to protect your hearing. Another great way to keep your hearing protected is to avoid loud noises whenever possible. There are many loud noises from power tools to machinery, and it is important to avoid these noises as often as possible. When it is not possible to avoid them, keep your hearing protected by using earplugs(耳机).
If you think your hearing may have already been damaged by modern technology, it is important to have your hearing tested by a physician. Only such a professional will be able to measure your level of hearing loss and help you find the best solution to your hearing problem.
For those with hearing issues, the choices have never been greater. There are many excellent hearing aids on the market. Having a hearing aid can be a perfect choice for the young and the old alike, and many people who swore they would never wear a hearing aid find that they love the convenience and quality these instruments represent.
Never let an unimportant thing like vanity(虚荣) get in the way of treating a hearing problem. These days there are hearing aids that are nearly invisible to the naked eye, including a number of models that fit completely inside the ear. If you believe you may be experiencing a problem with your hearing, it is important to have it checked out, and to take the right measures to protect your ears. In many cases, this treatment will be as simple as wearing earplugs. Taking care of your ears is of great importance. After all, you only get one set of ears.The second paragraph mainly talks about_____.
| A．the causes of hearing loss |
| B．the importance of hearing |
| C．how to cure hearing problems |
| D．how to protect your hearing |
The underlined phrase “under assault” in Paragraph 2 most probably means_____.
| A．under consideration |
| B．under protection |
| C．under attack |
| D．under treatment |
All the following factors may cause hearing problems EXCEPT_____.
| A．using iPods improperly |
| B．listening to MP3 at full volume |
| C．standing near machinery making a loud noise |
| D．using earplugs when there are loud noises |
The World Health Organization recently reported that the number of cases of tuberculosis(TB) has been abating since 2006 . Also, fewer people are dying from TB. But a study by researchers at the University of California, San Francisco, says smoking could threaten this progress.
Nearly twenty percent of all people use tobacco, and millions of non-smokers get sick from breathing the smoke. The new study predicts that smoking will produce an additional thirty-four million TB deaths by 2024.
Efforts to control the spread of TB have mainly focused on finding and treating infections. Fewer efforts have been made to understand the causes. Dr Anthony Fauci is the director of the United States National Institute of Allergy and Infectious diseases. He said, “Despite our control efforts, we still have more than a million people each year dying from TB and millions of people getting infected; we realize it’s still a very important problem. So we have to do the practical thing and we have to do the fundamental research things at the same time. ”
Smoking does not cause TB; bacteria cause the infection. But the study says smoking affects the nervous system in a way that makes an inactive case of TB more likely to develop into an active one. Stanton Glantz is the director of the University of California’s Centre for Tobacco Control Research and Education and an author of the new study. He says it shows that TB cannot be controlled unless tobacco use is controlled. He said, “It increases the number of people who will get TB by about seven percent.”
The study is described as the first to identify a direct link between tobacco use and rates of TB infection and death. Professor Glantz says the results should guide those creating health policies and TB control efforts. He said, “If you want to control the infectious disease of TB, you have to control the tobacco industry and the tobacco industry’s efforts to increase tobacco use, particularly in developing countries where TB is a big problem.” What would be the beat title for this passage?
| A．Scientists try to find the causes of TB deaths. |
| B．Study shows smoking is harmful to our health. |
| C．Study links smoking to millions of TB deaths. |
| D．Scientists pay more attention to TB deaths than before. |
What does the underlined word “abating” in Paragraph 1 mean?
| A．Responding | B．Surviving. | C．Rising. | D．Falling. |
What would Dr Anthony Fauci probably agree with?
| A．More efforts are needed to find the causes of TB infections. |
| B．TB infections are no longer a serious problem. |
| C．Few efforts have been put into the work of treating TB infections. |
| D．The practical and the fundamental research cannot be done together at present. |
It is implied in the passage that ____________.
| A．it is not very hard to control TB |
| B．smoking indirectly leads to TB |
| C．an inactive case of TB is deadly |
| D．people cannot blame smoking for TB |