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．

    Johnnie Martin was born in a worker's family. His parents lived a simple life, saving money for the day when they could send him to a good university. They had dreamed that their son could get a good job and live a better life. However, to Johnnie, school lessons seemed like a wall that was impossible to go through. They were not so easy for him.

    One day when he was in Grade 11, Johnnie went to the school psychologist's (心理学家的) office to ask for help. "I've been trying hard, but…" Johnnie was about to cry.

    The psychologist put his hand on the boy's shoulder, "People have different kinds of talents, Johnnie. There are painters, who were never able to learn math, and some day you will find what you are good at. When you do, you will make all of us very proud of you."

    Johnnie didn't go to university. He found a job in the garden in the town. Soon something amazing happened. People began to notice that Johnnie had what they called a "green thumb". The plants grew well and the roses were in bloom (花). People started to accept his advice for gardening (园艺).

    One day while he was walking, he found an unusual dirty land. He volunteered to make it into a garden. That afternoon he started the work, but he couldn't afford all the tools or the plants. People gave him young trees, rose-bushes, benches and many other things. Before long, it had become a beautiful little park.

    Today Johnnie is the head of the business in gardening. Wherever he and his men go, they spread beauty before the eyes of people.

    Clara Daly was sitting on an Alaska Airlines flight from Boston to Los Angeles when she heard a worried voice over the loudspeaker: "Does anyone on board know American Sign Language?"

    Clara, 15 at the time, pressed the call button. An air hostess came by and explained the situation. "We have a passenger on the plane who's blind and deaf," she said. The passenger seemed to want something, but he was traveling alone and the air hostesses couldn't understand what he needed.

    Clara had been studying ASL for the past year to help blind and deaf people and she knew she'd be able to finger spell into the man's palm. So she rose from her seat, walked toward the front of the plane, and knelt by the seat of Tim Cook, then 64. Gently taking his hand, she signed, "How are you? Are you OK?" Cook asked for some water.

    When it arrived, Clara returned to her seat. She came by again a bit later because he wanted to know the time. On her third visit, she stopped and stayed for a while.

    "He didn't need anything. He was lonely and wanted to talk," Clara said.

    So for the next hour, she talked about her family and her plans for the future. Cook told Clara how he had become blind over time and shared stories of his days as a traveling salesman. Even though he couldn't see her, she "looked attentively at his face with such kindness," a passenger reported.

    "Clara was amazing," an air hostess told Alaska Airlines in an interview. "You could tell Cook was very excited to have someone he could speak to, and she was such an angel."

Cook's reply: "Best trip I've ever had."

    A few days ago, I ran into a stranger as he passed by. I said sorry to him. And we were very polite. Then we went on our way after saying goodbye.

    Later in the kitchen at home, as I cooked our meal, my daughter Betty walked up to me. When I turned around, I nearly knocked her down." Get out of the way!" I shouted angrily. She ran away, crying.

    That night, when I lay in bed, my husband said to me, "You were so rude to Betty. Go and look around on the kitchen floor, and you'll find some flowers there. Betty brought those for you. She picked them herself--pink, yellow, and your favourite blue."

    When I heard this, I thought deeply, "While meeting with a stranger, I was calm and polite, but with my daughter, I was not patient." I felt sad and tears began to fall.

    I quietly went to Betty's bed." Wake up, my dear！"I said." Are these the flowers you picked for me?" She smiled, "I found them by the tree. I knew you liked them, especially the blue." I said, "I am so sorry that I treated you that way today." And she whispered(悄声说), "Mommy, that's okay. I still love you anyway." I kissed her and said, "I love you too and I do love the flowers."

    That day Betty gave me a lesson on how to get along with each other in the family. I spent much time on work before and didn't realize how important family life was. I decided to do better in the future.