Zoo elephants don’t live as long as those in the wild, according to a study sure to cause debate about keeping the giant animals on display. Researchers compared the life spans of elephants in European zoos with those living in Amboseli National Park in Kenya and others working on a timber enterprise in Buma. Animals in the wild or in natural working conditions had life expectancies twice than or more of their relatives in zoos.
Animal care activists have urged in recent years to discourage keeping elephants in zoos, largely because of the lack of space and small numbers of animals that can be kept in a group.
The researchers found that the median life span for African elephants in European zoos was 16.9 years, compared with 56 years for elephants who died of natural causes in Kenya’s Amboseli Park. Adding in those elephants killed by people in Africa lowered the median life expectancy there to 35.9 years. For the more endangered Asian elephants, the median life span in European zoos was 18.9 years, compared with 41.7 years for those working in the Burma Timber Enterprise. Median means half died younger than that age and half lived longer.
There is some good news, though. The life expectancies of zoo elephants have improved in recent years, suggesting an improvement in their care and raising, but “Protecting elephants in Africa and Asia is far more successful than protecting them in Western zoos.”
There are about 1,200 elephants in zoos, half in Europe, researchers concentrated on female elephants, which make up 80 percent of the zoo population. One amazing thing was that Asian elephants born in zoos had shorter life spans that those brought to the zoos from the wild.
Zoos usually lack large areas that elephants are used to in the wild, and that zoo animals often are alone or with one or two other unrelated animals, while in the wild they tend to live in related groups of 8 to 12 animals. In Asian elephants, baby death rates are two to three times higher in zoos than in the Burmese logging camps, and then, in adulthood, zoo-born animals die young. People are not sure why.What is argued about in this passage?
| A．Zoo elephants don’t live as long as those in the wild. |
| B．Elephants should not be on display. |
| C．Asian elephants are in danger. |
| D．Asia is far more successful in protecting elephants in zoos. |
What does the underlined word “median” mean according to the passage?
| A．Average | B．Longest. | C．Shortest. | D．Ordinary. |
Which of the following is Not the disadvantage of keeping elephants in zoos?
| A．Limited number of relatives. | B．Lack of space. |
| C．Shorter life expectancy. | D．Less attention. |
Who are expected to pay more attention to the issue addressed?
| A．Zoologists. | B．Animal care activists. |
| C．Zoo visitors. | D．The public. |
What exactly are white lions? "They are a color variation of regular lions," says William Swanson, director of animal research at the Cincinnati Zoo, in Ohio.
White lions are the result of a rare color gene mutation (变异). When both a male and a female lion carry the same white genes, there is a good chance that one or more of their cubs (幼兽) will be born with white fur.
Not many lions carry the white mutation. In nature, it's rare. A mutation can make an animal's survival more difficult. For example, being white makes it harder for the animal to mix with itssurroundings. Mutations also can cause physical problems, so those animals generally do not survive long enough to reproduce.
But sometimes white lion cubs are born among wild lions, especially in two areas of South Africa.
In 1975 two white cubs were spotted in the wild in South African reserve. They were seized and sent to a zoo. Today about 500 cubs of those two white lions and a few others known to have the white color gene live around the world in zoos, circuses, farms and private preserves.
White lions may be extremely rare in the wild, but breeders (饲养动物的人) know how to create more of them. This has created serious concern and debate.
White lions continue to exist only because they are inbred by people—fathers and daughters, sisters and brothers. Scientists worry that it also will cause health issues for white lions.
Inbreeding to create white lions as moneymaking attractions is only one concern. Another concern is that some people want to release captive-bred (人工繁殖的) white lions into the wild in South Africa to restore balance to the ecosystem. However, not everyone agrees that releasing these white lions into the wild is a good idea. Dan York of Hillsdale College has been studying white lion genetics and is worried. He says that because so many of today's white lions are inbred, it could spread health problems. If they breed with wild lions, they'll pass on the genetic problems to the wild population.
Instead of releasing captive-bred white lions, York suggests that South Africa concentrate on protecting all of its wild lions. That would ensure the safety of the wild population of lions, which may produce healthy white cubs in the future.It's difficult for a white lion to survive because __________.
a. its fur contrasts sharply with the surroundings
b. the mutation may cause physical problems
c. it is likely to be attacked by wild lions
d. it is hunted by human beings
| A．a, b |
| B．a, d |
| C．a, c |
| D．b, d |
What does the underlined word "inbred" inParagraph 7 probably mean?
| A．kept in enclosed space and unable to run away |
| B．bred in human-controlled environments with restricted settings |
| C．produced by breeding among closely related members |
| D．born among wild lions and kept in the zoo |
One of the reasons for inbreeding white lions is that __________.
| A．they can bring people a profit |
| B．their fur can be of great use |
| C．people want to keep white lions as pets |
| D．people want to study the genes of white lions |
Which of the following agrees with Dan York's opinion?
| A．It's useless studying white lion genetics. |
| B．White lion cubs born among wild lions are more healthy than captive-bred ones. |
| C．White lions shouldn't be kept in zoos or circuses. |
| D．The ecosystem in South Africa is being seriously damaged. |
To a large degree, the measure of our peace of mind is determined by how much we are able to live in the present moment. In spite of what happened yesterday or last year, and what may or may not happen tomorrow, the present moment is where you are—always!
Without question, many of us have mastered the sensitive art of spending much of our lives worrying about a variety of things—all at once. We allow past problems and future concerns to control our present moments, so much that we end up anxious, discouraged, depressed, and hopeless. On the other hand, we also put off our satisfaction, and put off what we should think of first, and our happiness, often convincing ourselves that "someday" will be better than today. Unfortunately, the same mental power that tells us to look toward the future will only repeat themselves so that "someday" never actually arrives. John Lennon once said, "Life is what's happening while we're busy making other plans." When we are busy making other plans, our children are busy growing up, the people we love are moving away and dying, our bodies are getting out of shape, and our dreams are slipping away. In short, we miss our life.
Many people live as if life were dress rehearsal (彩排) for someday in the future. It isn't. In fact, no one has a guarantee that he or she will be here tomorrow. Now is the only time we have, and the only time that we have any control over. When our attention is in the present moment, we push fear from our minds. Fear is the concern over events that might happen in the future—we won't have enough money, our children will get into trouble, we will get old and die, whatever.
To fight against fear, the best method is to learn to bring your attention back to the present. Mark Twain said, "I have been through some terrible things in my life, some of which actually happened. I don't think I can say it any better. Practice keeping yourattention on here, and now. Your efforts will pay off sooner or later."If a person is able to enjoy the present moment, then he __________.
| A．is out of mind |
| B．is in peace of mind |
| C．has forgotten his past |
| D．will ignore his future |
In the writer's eyes, "fear" is the __________.
| A．concern over past problems |
| B．attention on the present. |
| C．worry about what might happen in the future |
| D．anxiety about dress rehearsal |
By using what John Lennon said, the writer intends to __________.
| A．advise people to fix their attention on the present life |
| B．remind people to make good plans for their future |
| C．warn people that their children are growing up |
| D．remind people that their bodies are out of shape |
According to the writer, now is __________.
| A．the only time for us to get rid of what happened yesterday |
| B．the first time for us to look forward to our future |
| C．the only time we have and can control |
| D．the busy time we can make good preparations for the future |
The idea for a science experiment can come from an unusual place. After watching a YouTube video of a dancing bird named Snowball, a scientist in California decided to study the ability of animals to keep the beat.
Bird lovers have long claimed that their pets have rhythm, and there are many videos of dancing birds online. Until now, scientists have suspected that humans are the only animals that can accurately keep rhythm with music.
Thanks to Snowball, that scientific opinion is changing. Snowball is a cockatoo, a kind of parrot, and his favorite song is "Everybody" by the Backstreet Boys. When he hears the song, he moves his feet and rocks his body with the tempo, or pace of the music, as though he is the only bird member of the boy band.
Aniruddh Patel is a neuroscientist, or a scientist who studies how the brain and the nervous system contribute to learning, seeing and other mental abilities. He works at the Neurosciences Institute in San Diego. After seeing Snowball's dance online, Patel visited the cockatoo at the bird rescue facility he's called home for two years. The scientist played "Everybody" for Snowball and also played versions of the song that were sped up or slowed down. Sometimes, Snowball danced too fast or too slowly. Often, when there was a change in tempo, Snowball adjusted his dancing to match the rhythm. In other experiments, scientists have observed the same abilities in preschool children.
Patel isn't the only scientist who has studied Snowball's moves. Adena Schachner, who studies psychology at Harvard University, also wanted to know more about the dancing bird. Schachner's team played different musical pieces for Snowball and a parrot named Alex, as well as eight human volunteers. The scientists observed that the birds and thehumans kept time to the music with about the same accuracy.
Schachner and her team watched thousands of YouTube videos of different animals moving to music. Not all the animals could dance, however. From watching the videos, the scientists observed that only animals that imitate sounds, including 14 parrot species and Asian elephants, accurately moved in time to music.The underlined words "that scientific opinion" in the third paragraph refer to the theory that __________.
| A．birds like Snowball have the ability to keep the beat |
| B．humans are the only animals that can accurately keep rhythm with music |
| C．the brain and the nervous system contribute to some mental abilities |
| D．bird pets can have their special rhythm under human's instruction |
From the fourth paragraph we may know that __________.
| A．Patel is the only scientist who has studied Snowball's moves |
| B．Snowball is able to adjust his dancing to match the rhythm |
| C．Snowball cannot dance to the versions of the song "Everybody" |
| D．it is the brain and the nervous system that control the mental abilities |
The idea of studying animals' ability to keep the beat comes from __________.
| A．bird lovers' discovery |
| B．humans' musical sense |
| C．the same abilities in children |
| D．videos of dancing birds |
For the people living in the Nile Basin, the river is their life. This 6, 825 km waterway, whose watershed (流域) covers three million square kilometers, flows through mountains, woodlands, lakes and deserts. Its potential for fishing, tourism and shipping is great—but so are its challenges.
Water shortage, already serious in Egypt andSudan, will soon influence several other countries in the watershed as well. Today, about 160 million people depend on the Nile River for their living. Within the next 25 years, the district's population is expected to double, adding to the demand brought about by growth in industry and agriculture. The frequent drought (干旱) adds to the urgency.
Water quality is also a problem. Precious soil is washed out to sea. Wastes from industry and agriculture create pollution. Higher concentrations of salt influence irrigated soils. Water-borne diseases continue unchecked. In areas where it's hot and damp, water hyacinths choke off lakes, dams and other sections of the river, making it difficult for fishing and other businesses to move forward.
Native people along the narrow area of farmland have watched the sand move closer day by day. They've seen the river change course, and their only source (来源) of water thickened with mud. They're very poor and have few choices.
But a new program, the Nile Basin Initiative (NBI), is offering very practical assistance. The program is more than just a water-management project. It's a plan for the social and economic development of a vast district: it concentrates on the needs of the poorest of the poor and the environment that supports them.
These are whole ecosystem problems, calling for united solutions (解决办法). Half the Nile Basin's countries are among the world's poorest nations; yet, somehow, they must find the resources, skills and political will to overcome these challenges.What are the great challenges the Nile Basin faces?
| A．The development of shipping industry. |
| B．Overfishing of native people. |
| C．Water shortage and water quality. |
| D．Increasing population and tourism. |
The underlined word "hyacinths" in Paragraph 3 refers to "__________"
| A．animals |
| B．plants |
| C．rocks |
| D．salts |
The program NBI is mainly aimed at __________.
| A．preventing water pollution |
| B．changing the river course |
| C．improving living conditions of the poor |
| D．preventing land from becoming desert |
What would be the best title for this passage?
| A．People's Life in Egypt and Sudan |
| B．Frequent Drought in Egypt and Sudan |
| C．The Poorest Countries in the Nile Basin |
| D．The Ecosystem Problems in the Nile Basin |
More and more people are annoyed at the continually rising house prices. They want to know who is to blame for it. Local governments, developers and speculators share a vested interest in it. People who are really in need of homes are most likely to suffer heavy losses.
Many local governments depend on selling land to keep its normal operation. The higher land prices, the more money. Therefore, developers back the local governments by buying land at high prices. In return, the governments make favorable policies to help the developers. For example, drive all the possible home buyers to this nasty market. They even encourage large numbers of speculators to catch more people.
Rising house prices have already become the fence which divides the Chinese society. It has caused widespread dissatisfaction. The government will lose the support of the common people if leaving house prices out of control. Besides, rising house prices willstop us building the new country side as the present policy actually forbid people to flow freely from cities to the countryside.
Collecting taxes on houses can fundamentally solve this problem. On one hand, it will discourage the speculators. On the other hand, it will offer a stable tax resource apart from reducing the sales cost of the developers. Secondly, stop the developers selling the houses before completion. If so, the developers will certainly try their best to sell all their houses once completed. And this will also lower speculators' expectation of price rising, which will decrease speculations.The only victims of rising house prices are __________.
| A．governments |
| B．real home buyers |
| C．developers |
| D．speculators |
The local governments reward the developers by __________.
| A．offering enough land |
| B．allowing sales in advance |
| C．providing enough buyers |
| D．making favorable policies |
We can infer from the passage that continually rising house. prices will __________.
| A．benefit the government |
| B．draw more home buyers |
| C．help the housing industry develop soundly |
| D．affect the sound development of the Chinese society |
Collecting taxes on houses has all the following effects except __________.
| A．making the developers do their best to sell their houses |
| B．cutting down speculations |
| C．supplying a stable tax resource for the government |
| D．decreasing the sales cost |