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．

    Ann is my classmate. She comes from New York, and she lives in Shanghai with her parents now. Every morning, she goes to KFC to have breakfast. Sometimes she buys a hamburger for me. She can't speak Chinese well. In the evening, her father often helps her with it. He's a teacher in our school. He can speak Chinese very well.

    Ann thinks the school life(生活)in China is very interesting. Ann likes reading Chinese books because she wants to know more about China. She tries(努力)to talk with her Chinese friends in Chinese. She hopes to speak Chinese well. She is very happy to live in China. She loves people here.

    One day a woman wrote to a doctor to invite him to have a dinner with her family in the restaurant. The doctor wrote and answered, but he wrote too badly and the woman couldn't read it. "What can I do?" she asked her husband, "I don't know whether he is going to come or not. I don't want to call and say that I don't know what he writes. "

    Her husband thought for a few minutes and he had an idea. "Take it to the chemist, "he said." He will read it for us. "

    "Thank you, "the woman said, "That's a good idea." She went to the chemist's shop and gave the doctor's note to him. The chemist looked at it for a long time.

    "Wait a moment, please." he said, then he went to the back of the shop. After a few minutes he came back, carrying a large bottle to the woman. "Take one spoonful（一匙）every day." he told the woman.

    The story of Robinson Crusoe is known all over the world. The story is about the life of a real person. His name was Alexander Selkirk.

    Selkirk was born in 1676 in Scotland. His father made shoes and clothes, but Alexander didn't want to work in his father's shop. He wanted to sail a ship on the sea.

    When Selkirk was 28 years old, he was sailing on the Pacific Ocean. The ship was in a bad state. Selkirk was worried. "This ship is not safe!" he thought. He told the captain that he wanted to get off. The captain didn't like Selkirk, so he agreed. The ship took Selkirk to a small island.

    Selkirk took a few things from the ship: a gun, an axe, and a few clothes. Then the ship left, and Selkirk was alone. There were no people or houses on the island. He was more than 600 kilometres from the nearest country, Chile.

    He found a cave near the beach and this became his home for the first few months. In the day time, he had to leave the cave and find some food. He usually ate fish and other small sea animals. At night, he heard strange noises from the trees. He thought that there were wild animals on the island that could hurt him. He was afraid and didn't want to leave for the beach. He stayed in his cave. He was very lonely.

    One day, when he woke up，he saw hundreds of sea lions on the beach. He couldn't get to the sea, so he couldn't catch any fish. He had to look for food on another part of the island. He was still afraid of the wild animals, but he was hungry! He had to go out in order not to be hungry.

One evening, Brian told Mom that the boys at school had been laughing at him, because they knew he had to do the dishes every night at home. "I didn' t like it. Today 1 called me Cinderella," he said seriously. Mom could tell that Brian was 2 about what had happened. After dinner, Brian went straight upstairs, without stopping to 3 as usual. "I' ve got a lot of homework to do," he said. Mom was surprised but said nothing.

 When Brian got home from school the next day, he said 4 , "I' ve solved it, Mom." He had told the boys at school that he wouldn't do the dishes anymore, as he wasn't a 5 , "I'm not Cinderella," he said.

 The next morning, Brian came downstairs, ate his breakfast, 6 his lunchbox and set off to school as usual. But at noon he rushed into the 7 again. "Mom, there was nothing in my 8 !" he said. "How strange," Mom said. Brian 9 made himself two sandwiches and ran to school.

 That evening, before going to bed, Brian asked, "Mom, do you have a 10 pair of trousers for me? My laundry(洗衣) basket is full." Mom answered that she had been busy that day. The next evening 11 dinner, when Brian headed upstairs later to start his homework as usual, he came straight back down again. "Mom, my laundry basket is still full. Can you tell me 12 you will put a wash on?" he said. "Maybe tomorrow," Mom answered.

 All week long, 13 Brian kept asking his mom for things, Mom kept giving him almost the same answers. Until this afternoon after school, Brian got home and 14 his mom alone preparing dinner for the family, he suddenly got the 15 . Mom had been trying to tell him: he might not want to be Cinderella, but neither did his mom. After dinner, Brian did the dishes again himself.