Australia is the smallest continent in the world. It is a little smaller than China. It is on the Southern Hemisphere of the earth. Australia is big, but its population is small. The population of Australia is nearly as large as that of Shanghai.

    Enough laws have been made to fight against pollution. The cities in Australia have little air or water pollution. The sky is blue and the water is clean. You can clearly see fish in the rivers. Plants grow very well.

    Last month we visited Perth, the biggest city in Western Australia, and went to a wild flower exhibition. There we saw large numbers of wild flowers on show, most of which we had never seen before. We had a wonderful time. Perth is famous for its beautiful wild flowers. Every year in spring Perth has a wild flower exhibition. After visiting Perth, we spent a day in the countryside. We sat down and had a rest near a path at the foot of a hill. It was quiet and we enjoyed ourselves very much. When we heard bells ringing at the top of the hills, we looked up, but what we saw made us pick up all our things and run back to our car as quickly as we could. There were about three hundred sheep coming towards us along the path.

    Australia is famous for its sheep and kangaroos. After a short drive from any town, you will find yourself among the white sheep. Sheep, sheep, everywhere you can see sheep.

    According to new research from the University of Cambridge in England, sheep are able to recognize human faces from photographs.

    The farm animals, who are social and have large brains, were previously known to be able to recognize one another, as well as familiar humans. However, their ability to recognize human faces from photos alone is novel.

    The recent study, the results of which were published in the journal Royal Society: Open Science. Show the woolly creatures could be trained to recognize still images of human faces, including those of former President Barack Obama and actress Emma Watson.

    Initially, the sheep were trained to approach certain images by being given food rewards. Later, they were able to recognize the image for which they had been rewarded. The sheep could even recognize images of faces shown at an angle, though their ability to do so declined by about 15 percent – the same rate at which a human's ability to perform the same task declines.

    "Anyone who has spent time working with sheep will know that they are intelligent, individual animals who are able to recognize their handlers," said Professor Jenny Morton, who led the Cambridge study. "We've shown with our study that sheep have advanced face-recognition abilities, comparable with those of humans and monkeys."

    Recognizing faces is one of the most important social skills for human being, and some disorders of the brain, including Huntington's disease, affect this ability.

    "Sheep are long-lived and have brains that are similar in size and complexity to those of some monkeys. That means they can be useful models to help us understand disorders of the brain, such as Huntington's disease, that develop over a long time and affect cognitive abilities. Our study gives us another way to monitor how these abilities change," Morton said.

    Luke has always been my closest and constant companion these past five years. In fact, he is very friendly to me especially when I take care of other furry friends in our shelter.

    There have been a lot of forest fires during the summer season. Not far from our shelter, a forest caught fire during this hot summer. Luke rushed towards the forest where flames send out a terrible heat. There's no longer any hope at the moment to wait for Luke to come back to the shelter. In fact, I was waiting for the firemen to announce me his death in the forest. Suddenly, a fireman burst into my office and informed me that my dog Luke succeeded in saving four cats which were trapped by the flames. Luke seized the kittens, one by one moving them to a safe place.

    I immediately accompanied the fireman to the forest to pick up the rescued kittens, but Luke was not there. Then we heard the sound of a dog came from the forest barking furiously. The firemen followed the tracks of the dog until they found him barking loudly by the side of an injured fireman who was lying on the ground.

    That day, I was very proud of Luke for his two heroic actions. I paid a visit to the fireman accompanied with my adorable Luke. What a memorable scene when the fireman hugged Luke tightly to his chest! “One thousand thanks, Luke, for saving my life,” the fireman said.

    This true story of love shows us that pets are kind, loving, and caring. We should love and protect them. Don't belittle them. Little animals can make enormous things for humans.

    You probably know the basics of how comparatives(比较级) and superlatives(最高级) work in the English language. When comparing something, you often add an "-er" to the end of the comparative adjective. The general rule is that one-syllable(音节) words get the suffix(后缀), and polysyllabic words get "more" or "most." That is, unless the two-syllable word ends in a "y"; if that's the case, you will add the suffixes and change the "y" to an "i".

    But what about the word "fun"? This simple adjective only has one syllable, so you'd think you'd add suffixes on it to create superlatives. But if you were to say "I think Magic Kingdom is a funner park than Epcot." or "Disney World was the funnest vacation ever!" you might get some strange looks. It doesn't sound quite right. But…why? "Fun" is one syllable, so why do we choose "more fun" as the comparative—especially considering that the similar word "funny," which has more syllables than "fun," uses the suffixes with no problem?

    Well, the problem comes from the fact that the word "fun" was not originally an adjective. Until the early 19th century, it was mostly just a noun, and it gained its meaning as "amusement" in the 18th century. But as early as the 1800s, people began using it as an adjective, the way we'd describe "a fun time" or "a fun place" today.

    Basically, language is still developing. Grammarians have mostly come around to the use of "fun" as an adjective (though some dictionaries still call it informal). There was (and remains) an agreement of "Fine, you can use ‘fun' as an adjective…but, like, it's not really one, so it can't follow the rules of real adjectives." So they also agree that the answer to "is funner a word?" is yes. If you want to consider "fun," as an adjective, then "funner" is indeed a word, as is "funnest". But this doesn't mean that "more fun" and "most fun" are incorrect, though; in fact, in formal writing, you'll probably still want to use those instead of "funner" and "funnest."

    The English language is chock-full of uncertain grammar rules; there's no need to insist that a word breaks the common rules of language just because we didn't used to use it in a way we do now.

    A team of engineers at Harvard University has been inspired by Nature to create the first robotic fly. The mechanical fly has become a platform for a series of new high-tech integrated systems. Designed to do what a fly does naturally, the tiny machine is the size of a fat housefly. Its mini wings allow it to stay in the air and perform controlled flight tasks.

    "It's extremely important for us to think about this as a whole system and not just the sum of a bunch of individual components (元件)," said Robert Wood, the Harvard engineering professor who has been working on the robotic fly project for over a decade. A few years ago, his team got the go-ahead to start piecing together the components. "The added difficulty with a project like this is that actually none of those components are off the shelf and so we have to develop them all on our own," he said.

    They engineered a series of systems to start and drive the robotic fly. "The seemingly simple system which just moves the wings has a number of interdependencies on the individual components, each of which individually has to perform well, but then has to be matched well to everything it's connected to," said Wood. The flight device was built into a set of power, computation, sensing and control systems. Wood says the success of the project proves that the flying robot with these tiny components can be built and manufactured.

    While this first robotic flyer is linked to a small, off-board power source, the goal is eventually to equip it with a built-in power source, so that it might someday perform data-gathering work at rescue sites, in farmers' fields or on the battlefield. "Basically it should be able to take off, land and fly around," he said.

    Wood says the design offers a new way to study flight mechanics and control at insect-scale. Yet, the power, sensing and computation technologies on board could have much broader applications. "You can start thinking about using them to answer open scientific questions, you know, to study biology in ways that would be difficult with the animals, but using these robots instead," he said. "So there are a lot of technologies and open interesting scientific questions that are really what drives us on a day to day basis."

Christmas in the United States is traditionally a time of gift-giving and family gatherings. But small towns across the country have their own traditions.

Middleburg, a small town in the state of Virginia, is known for its horses. For more than 50 years, Middleburg has organized a yearly Christmas parade. Men and women ride horses through the woods and fields. They follow hunting dogs as they search for a wild fox. But first, these hunters ride in the yearly parade, wearing their bright red hunting clothes and hats.

John Hale, a citizen of Middleburg says many city people visit his town." We have a lot of people from an urban area that come to visit, but it incorporates a lot of the old traditions." The night-time hayride is one such tradition. Small groups gather under the moonlight on an open wagon (四轮马车) filled with hay (干草). The passengers sing as farm horses pull the wagon slowly across the fields.

There are some newer traditions, too. Trey Matheu works at the nearby Salamander Resort. He says a visit to Middleburg is a chance to slow down for a day. He says Middleburg can be a calming, peaceful place without tension.

"Middleburg is an opportunity to take a step back, to take a deep breath, and understand that even though life is moving on at a very fast pace, there's really an opportunity where you're allowed to step off for a little bit."

Parade organizers say more than 13, 000 people attend even in below freezing weather. But if you ask, you will hear many different reasons why people come to watch the parade:

"I come here because I'm from a small town. I like how everybody comes together."

"I live right down that street, right there. And that's my dog."

Middleburg looks its best at Christmastime. That may be why so many people return each year.