It is reported that conservation groups in North America have been arguing about the benefits and dangers of wolves. Some groups believe wolves should be killed. Other people believe wolves must be protected so that they will not disappear from the wilderness(荒野).

For Killing Wolves

    In Alaska，the wolf almost disappeared a few years ago，because hunters were killing hundreds of them for sport. However, 1aws were established to protect the wolves from sportsmen and people who catch the animals for their fur．So the wolf population has greatly increased. Now there are so many wolves that they are destroying their own food supply.

    A wolf naturally eats animals in the deer family. People in the wilderness also hunt deer for food. Many of the animals have been destroyed by the very cold winters recently and by changes in the wilderness plant life．When the deer can't find enough food，they die.

    If the wolves continue to kill large numbers of deer, their prey(猎物) will disappear some day. And the wolves will, too. So we must change the cycle of life in the wilderness to balance the ecology. If we killed more wolves, we would save them and their prey from dying out. We'd also save some farm animals.

    In another northern state, wolves attack cows and chickens for food. Farmers want the government to send biologists to study the problem. They believe it necessary to kill wolves in some areas and to protect them in places where there is a small wolf population．

Against Killing Wolves

    If you had lived long ago，you would have heard many different stories about the dangerous wolf．According to most stories，hungry wolves often kill people for food．Even today，the stories of the “big bad wolf” will not disappear．

    But the fact is wolves are afraid of people, and they seldom travel in areas where there is a human smell．When wolves eat other animals，they usually kill the very young, or the sick and injured. The strongest survive. No kind of animal would have survived through the centuries if the weak members had lived. And has always been a law of nature.

    Although some people say it is good sense to kill wolves，we say it is nonsense! Researchers have found wolves and their prey living in balance．The wolves keep the deer population from becoming too large, and that keeps a balance in the wilderness plant life.

    The real problem is that the areas where wolves can live are being used by people. Even if wilderness land is not used directly for human needs, the wolves can't always find enough food. So they travel to the nearest source, which is often a farm. Then there is danger. The “big bad wolf” has arrived! And everyone knows what happens next.

How to improve your happiness

    Recent research has shown that people who value their time over the pursuit of wealth are happier. So how can you best make, save and use your time — and ensure you keep a smile on your face?

● Pay someone to do the housework you hate

Why waste precious hours on housework or gardening if you can get someone else to do it?

● Set time limits on tasks you can't avoid

    Give yourself 20 minutes for necessary cleaning or 10 to hang out the washing. {#blank#}1{#/blank#}

● Enjoy standing in that queue

    With three people in front of you at the checkout, think about how busy you usually are and see the wait as a gift, not a bore(烦人的事情). {#blank#}2{#/blank#}

● Take on one new activity at a time

    {#blank#}3{#/blank#}At work and at home, be careful about the duties you take on. If you already feel stressed at work, don't do more at home.

● Learn to say no

    Be firm by declining a new project, or telling someone you can't talk right now or that you can only talk for a couple of minutes.{#blank#}4{#/blank#}

● Make lists your friend

    Start a wish list of the things you'd like to do and do more of the items that simply make you feel happy. Keep your daily to-do list manageable by putting it on an index card.{#blank#}5{#/blank#}

A. Be friendly but firm.

B. Make sure you start with an easy task.

C. This will get boring jobs out of the way faster.

D. Intending to do several things at once can be tiring.

E. Think about things that interest you, or wait patiently.

F. Trying to master too many new things at once can be unpleasing.

G. Recall things you're grateful for, talk to another customer or read a magazine.

    Ecotourism(生态旅游): A Different Way to Travel

    Are you attracted to obscure(偏远的)places? Do you prefer to vacation away from other tourists? Are you careful to take only memories and to leave only footprints? If you answered yes to more than one of these questions, you just might be an ecotourist.

    Ecotourists are people who want to experience the unspoiled natural world and leave it that way when they return home. This trend started in the 1990s and ecotourism is now growing three times faster than the tourism industry at large. The Ecuador's remote Amazon Basin(盆地) is contributing to that expansion, and it gives a snapshot of what ecotourism looks like.

    At the Ecolodge, a small group of cabins(小屋) sits Kapawi Ecolodge in the middle of the Achuar people's reserve(保护区) and is only reached by air. From here, visitors can explore parts of the Amazon rainforest seen by few outsiders. As they do local Achuar guides explain how the forest is like their supermarket, where they find food, clothing, medicine and tools. As a result, tourists learn to appreciate the local culture as well as the natural environment.

    The owners of Kapawi pay monthly rent to the Achuar people, but they also train the community to run and manage the lodge. They have agreed on a plan to turn the operation over to the Achuar completely by 2011.The owners are working to make ecotourism benefit and empower the local people.

    You probably won't start your own ecolodge, but you can be an ecotourist if you follow these guidelines: Protect the environment; Support local businesses; Respect the local customs and traditions.

    The world is full of fascinating places to visit. As an ecotourist, you can enjoy them yourself and make sure that they remain beautiful for future generations as well.

    A new collection of photos brings an unsuccessful Antarctic voyage back to life. Frank Hurley's pictures would be outstanding — undoubtedly first-rate photo-journalism — if they had been made last week. In fact, they were shot from 1914 through 1916, most of them after a disastrous ship wreck (海滩) by a cameraman who had no reasonable expectation of survival Many of the images were stored in an ice chest under freezing water, in the damaged wooden ship.

    The ship was the Endurance a small tight Norwegian-built three-master that was intended to take Sir Ermest Shackleton and a small crew of seamen and scientists, 27 men in all, to the southernmost shore of Antarctica's Weddell Sm. From that point Shackleton wanted to force a passage by dog sled across the continent. The journey was intended to achieve more than what Captain Robert Falcon Scott had done. Captain Scott had reached the South Pole early in 1912 but had died with his four companions on the march back.

    As writer Caroline Alexander makes clear in her forceful and well-researched story The Endurance、adventuring was then a thoroughly commercial effort Scott's last journey, completed as he lay in a tent dying of cold and hunger, caught the world's imagination, and a film made in his honor drew crowds Shackleton, a onetime British merchant-navy officer who had got to within 100 miles of the South Pole in 1908,started a business before his 1914 voyage to make money from movie and still photography. Frank Hurley，a confident and gifted Australian photographer who knew the Antarctic, was hired to make the images most of which have never before been published.

    Downloading music over the Internet is pretty common among high school and college students. However, when students download and share copyrighted music without permission, they are against the law.

    A survey of young people's music ownership has found that teenagers and college students have an average of more than 800 illegally copied songs each on their digital music players. Half of those surveyed share all the music on their hard drive (硬盘), enabling others to copy hundreds of songs at any one time. Some students were found to have randomly linked their personal blogs to music sites, so as to allow free trial listening of copyrighted songs for blog visitors, or adopted some of the songs as the background music for their blogs. Such practices may be easy and free, but there are consequences.

    Sandra Dowd, a student of Central Michigan University, was fined US $7,500 for downloading 501 files from Lime Wire, a peer-to-peer file sharing program. Sandra claimed that she was unaware that her downloads were illegal until she was contacted by authorities. Similarly, Mike Lewinski paid US $4,000 to settle a lawsuit（起诉）against him for copyright violation (违反). Mike expressed shock and couldn't believe that this was happening to him. “I just wanted to save some money and I always thought the threat was just a scare tactic(战术).” “You know, everyone does it,” added Mike.

    The RIAA （Recording Industry Association of America）, the organization that files lawsuits against illegal downloaders, states that suing (控告) students was by no means their first choice. Unfortunately, without the threat of consequences, students are just not changing their behavior. Education alone is not enough to stop the extraordinary growth of the illegal downloading practice.

Biofuels (生物燃料), gained from plants and animal matter, are a key solution to the environmental problems caused by fuels like coal. "Bioalcohol (生物酒精) is the most common biofuel and is produced by sugars found in materials such as corn. With some engine redesigned, it can be used directly by cars, buses, etc. ," says Professor Daniel Tan, "12 percent of transport fuel could come from biofuels, especially bioalcohol, by 2030. "

But a 2016 study of biofuels said, "Bioalcohol presently is mostly produced with food crops. Altogether, the environmentally-friendly biofuels rely on about 2-3 percent of the global water and land used for agriculture, which could feed a large number of hungry people. "

Energy experts have therefore been trying to deal with the problem. Recent research led by an international team found that the agave (龙舌兰) plant might offer a way out. This plant tends to be the right bioalcohol source to supersede others such as sugarcane (甘蔗) and corn.

Daniel Tan explains that the agave can be grown in unfavorable conditions and is not a major food crop. "It can grow in areas that lack water and rainfall without being watered by farmers, and it does not compete with food crops or put demands on limited water. This kind of useful plant is recently being grown in Australia. It can survive Australia's hot summers," he says.

The study finds that sugarcane produces just a little more fuel per square meter each year than the agave. However, the agave outperforms sugarcane in a range of areas, including pollution to the earth, and water using. The agave uses 69 percent less water than sugarcane and 46 percent less water than corn for the same amount of fuel produced. As for corn，it produces less fuel per square meter each year than the agave.

However, Daniel Tan states: "The first generation of bioalcohol from the agave recently faces a big competition from oil, whose recent low price makes it far more attractive to customers. Without some policy support from the government, bioalcohol production from the agave faces big challenges. "