Many animals recognize their food because they see it.So do humans.When you see an apple or a piece of chocolate you know that these are things you can eat.You can also use other senses when you choose your food.You may like it because if smells good or because it tastes good.You may dislike sonic types of food because they do not look,smell or taste very nice.Different animals use different senses to find and choose their food.A few animals depend on only one or their senses,while most animals use more than one sense.

    Although there are many different types of food,some animals spend their lives eating only one type.The giant panda eats only one particular type of bamboo.Other animals eat only one type of food even when given the choice. A kind of white butterfly will stay on the leaves of a cabbage,even though there are plenty of other vegetables in the garden.However,most animals have a more varied diet.The bear eats fruits and fish.The fox eats small animals,birds and fruits.The diet of these animals will be different depending on the season.

    Humans have a very varied（广泛的）diet.We often eat food because we like it and not because it is good for us. In countries such as France and Britain,people eat foods with too much sugar.This makes them overweight,which is bad for their health.Eating too much red meat and animal products,such as butter,can also be bad for the health. Choosing the right food,therefore,has become an area of study in modern life.

    As a young boy, I sometimes traveled the country roads with my dad. He was a rural mill carrier, and on Saturdays he would ask me to go with him. Driving through the countryside was always an adventure: There were animals to see, people to visit, and chocolate cookies if you knew where to stop, and Dad did.

    In the spring, Dad delivered boxes full of baby chickens, and when 1 was a boy it was such a fun to stick your finger 'through one of the holes of the boxes and let the baby birds peck on your fingers.

    On Dad' s final day of work, it took him well into the evening to complete his rounds because at least one member from each family was waiting at their mailbox to thank him for his friendship and his years of service. "Two hundred and nineteen mailboxes on my route." he used to say, "and a story at every one. " One lady had no mailbox, so Dad took the mail in to her every day because she was nearly blind. Once inside, he read her mail and helped her pay her bills.

Mailboxes were sometimes used for things other than mail. One note left in a mailbox read. "Nat, take these eggs to Marian; she's baking a cake and doesn't have any eggs. " Mailboxes might be buried in the snow, or broken, or lying on the groom:. bat the mail was always delivered On cold days Dad might find one of his customers waiting for him with a cup of hot chocolate. A young wrote letters but had no stamps, so she left a few button on the envelope in the mailbox; Dad paid for the stamps. One businessman used to leave large amounts of cash in his mailbox for Dad to take to the bank. Once, the amount came to 8 32,000.

    A dozen years ago, when I traveled back to my hometown on the sad occasion of Dad's death,  the mailboxes along the way reminded me of some of his stories. I thought I knew them all, but that wasn't the case.

    As I drove home, I noticed two lamp poles, one on each side of the street. When my dad was around, those poles supported wooden boxes about four feet off the ground. One box was painted green and the other was red, and each had a long narrow hole at the top with white lettering: SANTA CLAUS, NORTH POLE. For years children had dropped letters to Santa through those holes.

    I made a turn at the comer and drove past the post office and across the railroad tracks to our house. Mom and I were sitting at the kitchen table when I heard footsteps. There, at the door, stood Frank Townsend, Dad's postmaster and great friend for many years. So we all sat down at the table and began to tell stories.

    At one point Frank looked at me with tears in his eyes. " What are we going to do about the letters this Christmas?" he asked.

    "The letters?"

    'I guess you never knew. "

    "Knew what?"

    " Remember, when you were a kid and you used to put your letters to Santa in those green and red boxes on Main Street? It was your dad who answered all those letters every year. "

    I just sat there with tears in my eyes. It wasn't hard for me to imagine Dad sitting at the old table in our basement reading those letters and answering each one. I have since spoken with several of the people who received Christmas letters during their childhood, and they told me how amazed they were that Santa had known so much about their homes and families.

For me, just knowing that story about my father was the gift of a lifetime.

    Opened in 1847, the London Zoo is the world's oldest scientific zoo. Today it houses over 760 different species of animal and is the only zoo in London where you can experience big animals.

    Explore the “Into Africa” exhibit (展览) where you can come face to face with some of Africa's most unusual animals including hunting dogs, or try “Meet The Monkeys” an exciting walk-through experience. Other top exhibits include the Butterfly Paradise, where you can enjoy many species of butterfly as they fly around you.

    Make sure you don't miss feeding time at the Penguin Beach and find out more about these popular creatures from the zoo's experienced keepers. Penguin Beach, with a very large pool and underwater viewing areas, allows visitors to be close to the penguins like never before.

    Built in 2013, Tiger Territory is a great experience taking visitors deep into the world of these wonderful creatures.

    Rainforest Life is London's only living rainforest, where visitors can meet a variety of beautiful rainforest species including. In the all-new “Night Life” area you will discover the bats, and rats.

    With over 12,000 animals to see and incredible animal displays taking place throughout the day (including feeds and keeper talks), no visitor leaves disappointed. Learn more about London Zoo in our Interview with a Zoo Keeper on our London Pass Blog.

    You can visit the London Zoo for free with a London Pass—a fantastic saving of £23 for adults and over £16 for children. Children aged 3-4 will be charged on entrance fee for London Zoo.

    The Trans-Siberian Railway is a single train line that crosses nearly the complete length of Russia, from Moscow to Vladivostok. It covers a total of 5,772 miles, running from Europe to Asia. Unlike the longest flight in the world, which just began transporting passengers in 2018, the Trans-Siberian Railway started its business in 1916.

    Anyone who has taken this long journey, or even just part of it, will tell you that it travels at a rather slow speed, passing through some amazing, remote areas of Russia. You don't have to make the full journey without stopping. Instead, you're suggested to get off where there are attractive views, since it stops in some pretty fantastic places. But you certainly can take the full journey non-stop. If you do, the trip will take about 144 hours—six full days!

    You can book tickets with travel agencies. You can also make the booking online and tickets will be sent to your hotel or personal address. Children under 4 years old accompanied by adults can travel free, but cannot take up a seat. A child ticket needs to be bought if you want to get a seat for the child.

    There are longer railway services in the transportation world, but only one of them is a passenger line as some longer routes transport goods, not travelers. This railway may not be the fastest or the most modern, but it's clearly still an important player in the transportation world!

    On my first day of high school, going into math class, I was pointed and laughed at by two of my classmates. I initially thought my fly was open, or that something was stuck in my teeth. But as I took my seat, I heard one student whisper, "Why is a black boy taking Honors?" So, my fly wasn't open. An honors level class had simply been taken by a student whose skin was brown.

    Many people think my clothes should be big enough for me to live in, or expect me to listen to only "black music." In seventh grade, a group of my classmates fixed their cold stares on my clothes. They called out to me, "Go get your gangsta clothes." In one of my Spanish classes, the teacher asked me, "Do you like rap music or rock music more?" I replied, "Rock." The look of shock on my classmates' faces made me uncomfortable.

    Now I still take all Honors courses. I still wear clothes that fit me. My music library covers from rock to pop to techno, and almost everything in between. When it comes to choosing my friends, I am still colorblind. I continue to do my best to work in school in order to reach my goals; and yet, when I look in the mirror, I still see skin of that same brown.

    I believe in being myself. I believe that I myself should decide who I am and what actions I take in life. In high school, popularity often depends on your willingness to follow trends. And I've been told that it doesn't get much easier going into adulthood. But the only other option is to sacrifice my personality for the satisfaction and approval of others. This can be appealing, but I'm not going to do that.

    A new study has found the amount of antibiotics(抗生素)given to farm animals is expected to increase by two-thirds over the next 15 years. Researchers are linking the growing dependence on the drugs to the increasing need for meat, milk and eggs. However, the drugs could quicken the development of antibiotic-resistant infections(感染). Such infections are already a major public, health concern in the United States.

    The World Health Organization notes when people stop living in poverty(贫困), the first thing they want to do is eat better, rather than earn more money. For most people, that means their diet should contain more meat. With the rapid development of Asia, people there are eating nearly four times as much meat, milk and other milk products as they did 50 year ago.

    To meet the need, farmers have put many animals into smaller spaces. As the animals are crowded together, the easiest way to deal with some of the problems of crowding is to give them antibiotics. It's clear that antibiotics help animals stay healthy in a crowded environment and grow faster. But bacteria can develop resistance to the drugs gradually.

    Nowadays, doctors find antibiotics that once worked against the infections no longer work. The bacteria have learned ways to fight against the drugs. The heavy use of antibiotics in animals is responsible for the growth of antibiotic resistance worldwide. In the United States, at least two million people get drug-resistant infections each year and at least 23,000 die from an infection.

    Europe has banned the use of antibiotics to increase animal growth. And the United States is hoping to persuade farmers to stop using antibiotics for that purpose.