Mike wants to fly like a bird. His father tells him, "You can't fly like a bird because you are too big." "Why can't I? Some birds are big, but they can fly!" The boy doesn't understand. Bill is crippled. He wants to walk and run like other kids. "Why can't I walk or run like other kids?" Bill thinks.

      One day, the two boys meet in a park. "Do you want to fly like a bird?" Mike asks Bill. "No," Bill says. "I only want to walk and run like you."

      Then Mike walks to Bill's father. He says something to him. "That's OK," says the father. Mike goes to Bill and says, "Get on to my back．Let's run." Then Mike runs with Bill on his back. Bill is very happy and says, "We can fly, Mike! We can fly!"

阅读短文，从每题所给的四个选项（A、B、C和D）中，选出最佳选项。

    Some of the greatest problems we face today are the destruction (破坏) of our environment． Brown clouds, polluted water, endangered wild animals．．, these problems seem so huge．

    So my family does what we can． We take cloth bags to stores instead of using plastic bags． We walk where we don't have to drive．．．

    But does it do any good? When I am the only one in line at the market with cloth bags, am I doing any good? Does my walking to stores make any real difference to the world?

    I recently learned something about flamingos (火烈鸟) which like to get together in groups of a thousand or more． Every year, when the time comes for migration (迁徙), a few of them first takeoff from the lake． But none of the others seem to notice, so the small group returns．

    However, the next day they try again． This time few more fly along with them, but most of them still pay no attention, so they return again． They try for several times． Every time a few more birds join in but, since the thousands of others still take no notice, the great migration plan is once more stopped．

    Then one day something changes． The same small group of birds once again starts flying and a small number more join in just as before, then more． Finally, they all take flight and the migration really begins．

    What a spectacular sight it must be—thousands of flamingos taking off into the sky at once!

    A few can make a difference． Even if you're the one to take the first step, and continue trying, others will someday take notice and together we will solve even our greatest problems．

    O. Henry was a pen name of an American writer. He wrote short stories. His real name was William Sydney Porter. He was born in North Carolina in 1862. As a young boy he lived an exciting life. He did not go to school for very long, but he tried to teach himself everything he needed to know. When he was about 20 years old, O. Henry went to Texas. There he tried different jobs. He first worked on a newspaper, and then had a job in a bank. When some money was lost from the bank, others believed O. Henry took it. So people sent him to prison﹡. He stayed in prison for three years. There he learned to write short stories. After he got out of prison, he went to New York and went on writing. He wrote mostly about New York and the life of the poor there. People liked his stories, because they always finished with a sudden change at the end, to the reader's surprise.

    Born without arms or legs, Nick Vujicic knew from an early age that he was different. There is no medical explanation for Vujicic's physical disability. Though he struggles (挣扎) with some little things of everyday living (brushing teeth, for example), he has become a great speaker.

    Confidence didn't come naturally to Vujicic. Growing up in Melbourne, Australia, he struggled with depression (抑郁)and was bullied （欺凌）at school. When he was just 10 years old, he tried to kill himself. Thanks to his family's strong support and selfless love over time, Vujicic chose to be positive towards life. After his mother showed him a newspaper article about a man dealing with a serious disability when he was seventeen, he started to give public talks. The great Australian has visited more than 50 countries and given thousands of talks. No matter where he goes, he communicates the main message﹣that no matter what difficulties you meet, you can overcome ! Here's what he said in one of his powerful speeches：

    "I felt like I was a burden (负担)to those around me and the sooner I go, the better it'd be for everyone. I wanted to end my pain and end my life at a young age, but I am thankful once again, for my parents and family who were always there to comfort me and give me courage.

    Because of my emotional struggles I had experienced with bullying and loneliness, God has given me a passion (激情)of sharing my story and experiences to help others deal with whatever difficulty they have in their life and let God turn it into a blessing. To encourage and inspire others to live to their fullest potential and not let anything get in the way of achieving their hopes and dreams."