阅读下面短文, 从每小题所给的A、B、C、D四个选项中选出最佳选项。

    Wikipedia is an online free encyclopedia. There are more than 38 million articles about society, history, culture, music, science, technology, geography and so on. On this website, people can find articles about almost everything in the world. Wikipedia has also developed 292 language versions for people to read in their own languages.

    Jimmy Wales and Larry Sanger started this encyclopedia project on 9th March, 2000. It was called Nupedia at first. And all the articles were written and checked by experts. Wales thought that the website should be a place where its users could not only find information but also share what they knew. So they tried to use a wiki system（wiki is a Hawaiian word "wee kee wee kee" which firstly meant "quick"）. On 10th January, 2001, they began a new project to improve Nupedia. On 15th January, 2001, the new online encyclopedia named Wikipedia was set up. Wikipedia achieved a great success.

According to the Alexa Traffic Rank report on 22nd May, 2016, Wikipedia is the seventh most popular website in the world. Every single user helps to make this popular free encyclopedia.

      The next time you look up at the sky and see a cloud that looks like Mickey Mouse or your favorite fruit, look again. It may not be a cloud, but a Flogo -- a logo that flies. It's a new form of advertising in the sky that's never been used before. It's a different way to market your products, logos, and events.

     These funny logos are made with soap bubbles （肥皂泡） mixed with a little helium gas （氦气） ,which makes them lighter than air and float in the sky. Special machines are used to make these new funny Flogos. The machine, which can be rented for $ ,500 a day, can make a Flogo every 15-5 seconds.

      Flogos can fly much higher or lower if needed. They can last from a few minutes to an hour anywhere in the sky, depending on the weather conditions. Though they can fly up to 0, 000 feet, they usually float around at 300- 500 feet. Flogos are only white now, but people hope to have more colorful Flogos in the near future.

     Flogos are Green, 100% environmentally safe, because the soap used to make the Flogo comes from plants and leaves. So this fun way of advertising is healthy and good for the environment.

    Birdwatching is becoming more and more popular in many parts of the world．

    Birdwatchers enjoy looking for and listening to different kinds of birds．To watch birds, all you need is a pair of binoculars, a field guide and love for birds．

    If you are just starting birdwatching, buy one of the cheaper pairs of binoculars．You can choose better ones when your needs and skills grow．A field guide helps you leam about the birds' appearances, calls and habits before birdwatching．

    When you are ready, it's best to go to the wild with someone who is more experienced．You can join a birdwatching group to learn about some beginning skills．A local bird club is ideal．

    Start birdwatching in the morning, when birds are searching for food．Most of the time, you will hear bird calls from all around you, but will not see any birds easily．Look for movement in trees, and bring your binoculars to your eyes．

    The most important work for a birdwatcher is to identify the birds he/she sees．A bird's shape, size, colour and habits can help a birdwatcher identify it．When you identify a bird, don't forget to take notes about it on your notebook．

    To find more and different birds, you may wish to plan trips to birds' different living areas： forests, lakes, rivers, wetlands, etc．

    When watching the birds, you should always keep in mind： respect wildlife and protect its living areas．

    Possible Earth-Like Planet Next Door?

    Scientists say they discovered an earth-like planet outside our solar system (太阳系). It is a planet that could support life.

    This planet is just 4.2 light years away from us. It is so close that space scientists have considered it as a next door neighbor. They say it could be reached by an unmanned spaceship before the end of the century -- in time for people alive today to see it.

    An international team of scientists found the planet moving around the star called "Proxima Centauri". The result came out last month from the scientific magazine Nature.

    Scientists have long thought that a planet with water is important for life. And it has to be neither too hot nor too cold. The newly-discovered planet is a little larger than earth Scientists have named it Proxima B. It moves around its sun, Proxima Centauri, once every 11 days.

    American scientists have been using instruments for years to look for earth-like planets. In 2013, scientists' best guess was that there are about one billion (1,000 million) "earths" in space.

    Alan Boss is the chairman of a group for outer space research. He said that Proxima B not only confirms (确认) the discovery of a planet, but also increases the number of other possible“earths” greatly.

    Boss said it is possible, even likely, that most stars have at least one earth-like planet, which he considers surprising.

    So from the early number of a billion, this new research suggests there may be as many possible earth-like planets as there are stars in the Galaxy (银河系). That is, anywhere from 250 billion to 500 billion "earths".

    This makes the possibility of living things increasingly likely Boss said he believes human beings will be able to show that there is life in places besides earth in his lifetime. "I am 65," he said, "but I expect to still be alive when it happens."

    Honey to treat a wound. Eat cherries(樱桃) if someone has a pain in his knee. Your grandmother is probably satisfied with her old-time treatments and now science is catching up with them. Researchers have produced hundreds of studies in the past five years about these grandmothers' old-time home treatments. They are often natural, different from the medicine from the hospitals. Here are some old-time treatments which have been proved（证明） to be useful by the scientists.

    Imagine a world with no more animals: no elephants, no tigers or lions. To some people, that thought is too terrible for words. So they are doing something about it. Tiffany Soechting is one of them.

    Being among wild animals—feeding them and caring for them—is all Tiffany Soechting has wanted to do with her life. And that is exactly what she does!

    Soechting is the human "mother" to the 500 animals that live on her family wildlife farm in San Antonio, Texas. On the farm, she cares for animals from around the world. Soechting says she loves them all. However, two reticulated giraffes(网纹长颈鹿) take up a special place in her heart. Their population in the wild has become smaller by 80% in the last 15 years. "I'm so glad to get help from five wildlife researchers that took giraffes up to a higher level. All our hard work helps protect giraffes living in the wild."

    Besides her animal caring, Soechting also holds monthly classes, where she teaches school children about the animals.

    Soechting also opens the farm to the public. Visitors not only learn about the animals, they can also get close to them. And the animals are not against that. For them, people are part of their natural environment.

The farm is part conservation(保护) area, part educational center and part animal park. As the animals walk peacefully around the grounds, it is easy for them to forget that San Antonio, a busy city, is just a few minutes away.