New York's iconic, blue-green statue of liberty wasn't always green. When the statue was gifted to the US from France in 1885, she was actually a shiny copper color. A new video reveals the chemical reactions involving oxygen and even air pollution that led to her color change from copper to liberty green. The statue of liberty was a gift from France to the US as a way of commemorating the US's fight for independence, as well as their own aspiration for democracy.

    A video, published by the American Chemical Society, explains that the 305-foot (93 meter) statue was built over nine years in sections of copper skin on top of an iron skeleton.

    In her first few decades in the Big Apple, the statue slowly turned from that shiny copper color to a dull brown and the, finally, to the blue-green, or as they'd say back in France, 'verdigris' we see today,' said the video's narrator.

When it changed color, some officials suggested restoring her back to her original color, but after the public protested against this decision, she was left the way she is. The statue's color change was as a result of oxidation reactions between copper and the air. But it was more than one reaction - the color change is due to about 30 years worth of different reactions leading to a mixture of greenish minerals.

    Oxidation reactions happen when an atom loses an electron to another atom.

    In the case of the statue of liberty, her color change was bound to happen due to oxygen in the atmosphere that is 'hungry' for electrons. On top of this, elements of New York City's polluted air added to the color change too.

The first chemical reaction of the color change involved copper giving up electrons to electron-hungry oxygen in the atmosphere. This led to a mineral called cuprite - which is pinkish red.

    Then, cuprite loses even more electrons to oxygen, forming a new mineral（矿物质） called tenorite, which is blackish in color. The black color of tenorite explains why the statue got darker over time, forming a dark brown color.

    Then, further chemical reactions occurred when sulfur（硫） in the atmosphere reacts with oxygen to form sulfur dioxide. Sulfur comes from natural processes such as volcanic eruptions, but also from man-made emissions from boats, cars, airplanes and factories. When sulfur dioxide in the atmosphere reacts with water, it produces sulfuric acid. Sulfuric acid forms green minerals with copper oxides, so the sulfuric acid in the atmosphere made the state green over time.

    Added to that, chloride from the sea spray surrounding Ellis Island where the statue is located made the statue even greener.

    The statue stayed this way for over 100 years because the exposed copper is now oxidized and stable, but the statue wouldn't be the same anywhere else.

    Hold your smartphone, smile at the front camera, and click! You get a selfie. There is no doubt that this photo is yours. But if a monkey takes a selfie, does the camera owner have the right to decide how to use it?

    Recently, this question has caused a problem between Wikimedia Foundation, a non-profit organization, and British wildlife photographer David J. Slater.

    In 2011, Slater was visiting a park in Indonesia when a macaque(猕猴) got hold of one of his cameras. “They were quite naughty, jumping all over my equipment,” Slater told The Telegraph, “and it looked like they were already posing for the  camera when one hit the button.” The result was hundreds of monkey selfies. The best of images was a female macaque grinning toothily into the lens.

    This week, the grinning monkey selfie returned to the news when Wikimedia refused Slater's request to take the photos down from Wikimedia Commons, a website that is run by the organization and offers free images.   5

According to Wikimedia, anyone who downloads the monkey selfie, or any of the millions of images on the site, can “copy and use any works here freely as long as they follow what the author says.” The question that arose here was whether Slater, who had not held the camera, set up the shot, or pressed the shutter(快门) button, could be considered the photographer of the monkey selfie. Wikimedia's position on this was clear: as the work of a non-human animal, this photo has no human author who owns the copyright.”

    Only authors of creative works, like a piece of writing or a song, own copyrights. In terms of photos, US copyright law says whoever pushes the button on the camera owns the copyright to the image produced, which means that if tourists ask you to take a photo of them, and you happen to hit the shutter button at the exact moment that Justin Bieber, a Canadian singer, made faces behind them. You, as the photographer, would have the photo's copyright and sell it. The tourists, who own the camera on which the photo was taken and asked you to take the photo don't get the right to use it without you allowing them to. All this has been complicated by the appearance of surveillance cameras(监控摄像头), smart phones, and large-scale photography projects for which assistants often press the shutter button to produce works whose copyrights belong to their boss.

    Slater seems to be thinking along these lines. He says that buying the cameras, spending thousands of pounds to transport himself to Indonesia, and allowing the monkeys to “steal” his cameras makes him the author of the image, regardless of who pushed the button. “In law, if I have an assistant then I still own the copyright,” he told the “Today” Show. “I believe in this case, the monkey was my assistant.”

    If that seems unfair, think about this. If a person left her laptop in a café, and a poet picked it up, opened up a word-processing program, and typed out a poem which turned out to be the best poem of this generation, could she ask for much more than her laptop back?

    Having a pet dog at home can be beneficial in many ways. It can teach you the value of responsibility, companionship, and caring for something other than yourself. Owning a pet dog is not just a temporary thing{#blank#}1{#/blank#}You should care for your pet dog properly so you do not neglect it and help your parents train the pet dog so it is well behaved. You should also make sure you deal with any issues your pet dog is having responsibly so you do not harm your pet dog in any way.

    {#blank#}2{#/blank#}You should start by providing the necessities for your pet dog, including food and fresh water. Your parents may already have a feeding schedule set up, with set times in the day for feeding your pet dog. You should follow this feeding schedule and ask your parents if you can help it with giving your pet dog food and water on a daily basis.

    Clean up after the pet dog. You can also be a good pet owner by making sure you clean up after your dog. This means picking up any food that falls out of its food bowl and wiping up any water around its water dish so its feeding area is clean.{#blank#}3{#/blank#}

    Take your pet dog for daily walks.{#blank#}4{#/blank#} You should create a walking schedule with your parents and assist your parents in walking your pet dog. You may put the collar or harness on the dog and take a tarn holding the leash during the walk, with the supervision of a parent.

    Play with your pet dog. You should spend at least ten to fifteen minutes a day playing with your pet dog so that it feels loved and acknowledged by you{#blank#}5{#/blank#}

A. Give food and water to the pet dog.

B. Train your pet dog with simple orders.

C. It is a permanent responsibility that you must care for on a daily basis.

D. Never ever try playing jokes on your pet dog, because it will get hurt easily.

E. You should also use encouraging words and reward it with a treat if it behaves well when playing.

F. You can also pick up any pet toys and put them in one area so that they are not scattered all over house.

G. M you have a pet dog that is medium to large in size, you will need to walk it on a daily basis.

    Having a pet dog at home can be beneficial in many ways. It can teach you the value of responsibility, companionship, and caring for something other than yourself. Owning a pet dog is not just a temporary thing{#blank#}1{#/blank#}You should care for your pet dog properly so you do not neglect it and help your parents train the pet dog so it is well behaved. You should also make sure you deal with any issues your pet dog is having responsibly so you do not harm your pet dog in any way.

    {#blank#}2{#/blank#}You should start by providing the necessities for your pet dog, including food and fresh water. Your parents may already have a feeding schedule set up, with set times in the day for feeding your pet dog. You should follow this feeding schedule and ask your parents if you can help it with giving your pet dog food and water on a daily basis.

    Clean up after the pet dog. You can also be a good pet owner by making sure you clean up after your dog. This means picking up any food that falls out of its food bowl and wiping up any water around its water dish so its feeding area is clean.{#blank#}3{#/blank#}

    Take your pet dog for daily walks.{#blank#}4{#/blank#} You should create a walking schedule with your parents and assist your parents in walking your pet dog. You may put the collar or harness on the dog and take a tarn holding the leash during the walk, with the supervision of a parent.

    Play with your pet dog. You should spend at least ten to fifteen minutes a day playing with your pet dog so that it feels loved and acknowledged by you{#blank#}5{#/blank#}

A. Give food and water to the pet dog.

B. Train your pet dog with simple orders.

C. It is a permanent responsibility that you must care for on a daily basis.

D. Never ever try playing jokes on your pet dog, because it will get hurt easily.

E. You should also use encouraging words and reward it with a treat if it behaves well when playing.

F. You can also pick up any pet toys and put them in one area so that they are not scattered all over house.

G. M you have a pet dog that is medium to large in size, you will need to walk it on a daily basis.

增加：在缺词处加一个漏字符号（∧），并在其下面写出该加的词。

删除：把多余的词用斜线（\）划掉。

修改：在错的词下划一横线，并在该词下面写出修改后的词。

注意：1）每处错误及其修改均仅限一词；

2）只允许修改10处，多者（从第11处起）不计分。

    I'm a huge book-lover but like sharing my love for books! So I've been bought books constantly. Finishing reading one book, I placed it in or around my school so that some of my schoolmate can enjoy themselves when reading it. I especial like placing it on a stone table in the little garden in that students might have time to take a rest. I was delighted an other day when I saw a card left on the table to say thanks. And from the card, I knew my book turned out of to be a birthday gift for a strange girl. It was so lovely find out that my book could bring anyone pleasure!

    Mother's Day is around the corner, and to mark the occasion, I want to share with you what Mom taught me, impressed upon me, and how she otherwise shaped me.

    From my earliest 1 I felt as if my mother was preparing me for 2 special. When we entered a room, her entire focus was on me. I felt as if I was the 3 of her universe — a great feeling. Offering her the same4 I intently listened to her stories without5 I tried to return that feeling of being truly loved.

    6 there was always deep affection flowing between us, she wasn't a softy (心肠软的人). She worked hard and 7 her children to do the same. I began working in our little corner grocery store by age eight and8 it by the age of twelve. She9 my hard work and treated me as an equal. I learned that I could do anything through hard work. I learned10.

    Mom always supported my decisions, but also11her concern. When I decided to retire early from teaching to writing about etiquette (礼仪), she announced her concern. She 12 that there wasn't a13 for it — my mom, always the business person.14 by the end of our conversation she 15 me with, “With your training and love of people, you are 16 for this.” She followed quickly with a saying I'll always remember, “Nothing is 17 to a man who will have a try.” Thanks, Mom.

    By18 my mother taught me how to show respect for others. She gave me my listening skills, my courage, and my manners. Through her, I 19 to be strong, to follow my heart, and to work hard. I never 20 If not for this, I wouldn't be a successful business owner and good friend to all.

    Melbourne, Australia

    Melbourne is a hotspot travel destination, and it's easy to see its beautiful beaches and busy city life.

    Why it's a great choice: Australia as a whole is considered a safe destination for international travel, and because of that, many solo travelers go there. As an English-speaking country, you won't be faced with any language barriers. Melbourne is easy to get around because you can walk or bike practically anywhere!

    Thailand

    Thailand is great for solo travelers — perhaps because it is one of the Buddhist mindsets, which promote equality among the sexes.

    Why it's a great choice: Thailand is known for its friendly atmosphere, and as a travel hotspot, there are plenty of chances to meet other like-minded travelers. Well known for being very cheap, especially in the north. A good choice if you want to get away on a budget. Thailand has a lot to offer, from the party- central Bangkok to beautiful beaches and tropical (热带的) jungle.

    Hong Kong, China

    Hong Kong is a great place to relax for solo travelers as it is full of “Zen Moments”, such as beautiful gardens and Tai Chi classes.

    Why it's a great choice: Hong Kong is regarded as one of the safest cities in the world. If you're not well traveled, or perhaps a bit tired of things like language barriers, Hong Kong is a great place to start, as it mixes both Eastern and Western at the same time.

    Bali, Indonesia

    Bali is a spiritual place with yoga, spas, healthy food and beaches. The combination of friendly people and splendid visual culture has made Bali number one tourist attraction.

    Why it's so great: you won't be the only solo traveler in Bali. Everyone is known for being extremely friendly and you're sure to meet some amazing characters along the way. As a Hindu island, Bali is the perfect place for a relaxing and spiritual retreat (静修). The Sacred Monkey Foresting Ubud is fantastic 一 if you like monkeys, anyway.