阅读下面短文，掌握其大意，然后从各题所给的A、B、C、D四个选项中选出最佳选项，并将选定答案的字母标号填在题前括号内。

     Farley worked for the Canadian government. One day，he was1 to learn more about wolves. Do wolves kill lots of caribou (北美驯鹿)? Do they kill people?

     They gave him lots of food and clothes and guns. Then they put him on a plane and took him to 2 . They put him down and went away. There were no houses or people in this place. But there were lots of animals and lots of wolves.

People tell terrible stories about wolves. They say wolves like to kill and eat people. Farley remembered these stories，and he was 3. He had his gun with him 4 .

     Then one day， he saw a group of wolves. There was a mother wolf with four baby wolves. A father wolf and another young wolf lived with them.

     Farley watched these wolves every day. The mother was a very 5 mother. She gave milk to her babies. She gave them lessons about life. They learned how to 6 food. The father wolf got food for the mother. The young    wolf 7 the children. They were a nice， happy family — wolf family! Farley did not need his8anymore. In a short time，he got on well with the family. Farley watched them for five months. He learned that many stories about the wolves were 9. Wolves do not eat people， and they do not eat many large animals. And he also learned bad things about men. It was men who killed many caribou and wolves.

     Later， Farley wrote a book about wolves. He wanted people to10 them and not to kill them.

    An old friend from the US whom I was looking forward to staying with, telephoned from the airport to tell me that he had arrived. I was still at the 1 at that time, but I had got everything ready for his arrival. After letting him know where my house was, I told him that I had the 2 under the door-mat (门垫). 3 I was possible to be home rather late, I told him to go into the 4 and help himself to food and drink.

    Two hours later my friend 5 me from the house. At the moment, he said, he was listening to some of my records after having just had a truly wonderful 6. He had found a cooker and 7 two eggs and had helped himself to some cold chicken from the ice box. Now, he said, he was drinking a glass of orange juice and he hoped I would 8 him. When I asked him if he had reached the house without difficulty, he answered, "I was not able to find the key, but 9 the living room windows just by the apple tree were left open and you know what I could do."

    I listened to all this in 10. In front of my living room there was no apple tree at all.

    When Mary Smith was a1, she wanted to be a teacher, 2 she liked children. When she was twenty, she began teaching in a small school. She was a good teacher, and she3 a lot with the children in her class. They4 her teaching.

One day5of the girls in her class said to her, "Miss Smith, 6does a man's hair become grey before his beard（胡子）does？"

Mary laughed and answered, "I don't know. Helen, do you know？"

    "I don't know7, Miss Smith, "said Helen, "but it happened to my father." The8children in the class laughed when they heard this.

    Then a boy said, "I9, Miss Smith! A man's hair becomes grey10because it's sixteen years older than his beard."

   "Jane, please let me borrow a dollar," Jenny asked as they stood in the school lunch line." I have one in my jacket, but I don't want to1and lose my place."

   "OK," agreed Jane.

    Jane waited all day for Jenny to2back the dollar she borrowed, but Jenny always seemed to be3."She just forgets about it," thought Jane." I don't want to make her angry." Still, her money didn't go4. Some classmates, like Jenny, were5five dollars a week.

    Weeks went by. At last Jane got enough courage to ask her about the money.

   "Oh Jane, I6!" Jenny said." I'll bring the dollar tomorrow." The next day Jenny seemed to have forgotten again. During the noon hour, Jane saw her buying sweets for Mary and Ann. Jenny saw Jane looking at her.7she said something in a low voice to the other two girls. Jane felt8and asked her teacher if she could go back to the classroom.

    In the classroom, Jane saw two new pencils on Jenny's desk. An9came to her," Jenny's not10recently, and anyway, she really owes (欠)me. Besides, she has money to buy more. A dollar doesn't mean anything to her, but it means a lot to me."

    At first I didn't know what was happening to me. I started feeling sad,1and empty. My mum advised me to start 2others. I was confused (困惑的). But I decided to have a try. The next day, I went to a house.

    The house was for young girls. They were left behind by their 3. When I arrived, I felt 4. I didn't know how to talk to them. So I started helping them to do their homework. And I started going there very often and 5enjoying it.

    One day, I met a little girl in the house. She started asking me about my 6. She was interested while asking me questions about my family. I was really surprised because she seemed to 7 each of my answers. When I asked her if she knew her parents, she said no. This really broke my 8.

    When I left that day, the girl 9 me if I could visit her more often. I smiled and said yes. I was really happy to help this 10 girl. But in fact, this little girl helped me and taught me more.

Jenny is excited to go to school these days. The 13-year-old girl from South Gate Middle School in Los Angeles, US, is taking care of three green abalones(鲍鱼) at school.

The students of Violeta Llamas' science class, including Jenny, have cared for the sea animals since January. The science class has eight teams. Each team takes turns to care for the abalones. Team Five—Jenny, Alexis, Jennifer and Ricardo—have now got their turn.

The abalones are kept in a box of seawater. Every day, Alexis checks if the water has too much salt. Too much salt is bad for the health of the abalones. Jenny makes fresh seawater. Then the four students work together to clean up the waste in the box and give some food to the abalones.

    "Sea life is like a baby. You have to clean them and care for them. " Jennifer said.

Nancy Cruso, a scientist, leads the project. She said the number of green abalones is going down because people have caught too many of them. She said protecting the sea lives now depends on the young students.

"The students love taking care of the abalones. " said Llamas.

"Taking care of the abalones could open the door for those who want to be a sea life scientist or an environment protector," she said.

The students' time with the abalones will end this school year. Cruso and a team of volunteers will record the abalones and then let them return to the sea.