阅读下面短文，从每题所给的A、B、C、D四个选项中，选出能正确回答所提问题或完成所给句子的最佳答案。

     Sixteen years ago, a boy gave me an important gift. It was a smile.

      It was the early autumn of my first year at a middle school, and my old school was far away. As a result, no one knew who I was. I was very lonely, and afraid to make friends with anyone.

     Every time I heard the other students talking and laughing, I felt my heart break. I couldn't talk with anyone about my problems.

Then one day, my classmates were talking happily with their friends, but I was sitting at my desk unhappily as usual.  At that moment, a boy entered the classroom. I didn't know who he was. He passed me and then turned back. He looked at me, with a smile.

    Suddenly, I felt the touch of something bright and friendly. It made me feel happy and warm. That smile changed my life. I started to talk with other students and made friends. Day by day, I became closer to everyone in my class. The boy with the lucky smile has become my best friend now.

    One day I asked him why he had smiled, but he couldn't remember doing so!

     It doesn't matter because all the dark days have gone. I believe that the world is what you think it is. If you think it is lonely, you might always be alone. So smile at the world and it will smile back.

A

      A month ago, the Greens went along the coast and finally got to Daytona beach (代托纳海滩) to spend their holiday. It was 200 miles away from their home in Florida. They took their pet cat with them. The cat got frightened because of some noise during the holiday. Then it ran away. The Greens looked for their pet for a long time,but they didn't find it. They had to leave for home. In fact, the cat traveled for a long time and got back to Florida after it was lost.

     Luckily, a woman called Sarah in Florida found the cat in her garden.The cat was too weak to make a sound, lying there only. When the pet doctor examined the cat and found a chip (芯片) inside the cat's body. And there was all kinds of information about the cat in the chip. Sarah knew that the Greens were the owner of the cat. Sarah took it home and looked after it quite well. The cat became better after a few days.

     Sarah wanted to sent the cat back to the Greens. However, how did the cat get home far away from 200 miles? Maybe only the cat itself knew it.

    Her name is Mary. She comes from America. She is in China with her father and mother. She can speak a little Chinese. She studies in No. 80 Middle School in Tianjin. She is in the same school as her parents (father and mother). She is a good student. She goes to school six days a week. She likes getting up early. She doesn't like to be late. She often goes to school very early. But today she gets up late. So she gets to the classroom at 7 :30. But there aren't any students in it. She is not late（迟到）. She is still early. It's Sunday today. The students are all at home.

    Mrs.White had a lovely young cat，and it was the cats first winter.One evening，it was1 outside when it began to snow.Mrs.White2 everywhere and shouted its.But she couldn't find it.So she3 the police，and said，"I4 a cat.Did anyone find one？""No，Madam" answered the policeman at the other end."I will ring you up if someone finds it.What5 is your cat？""white.""I think it may be in the snow.But don't worry.I know cats are really very6 animals."They sometimes live for a few days in the snow, and they're quite all right" Mrs.White felt7 when she heard this."Yes，yes.I think you are8"She said，"and my cat is very clever.She can almost talk." The policeman was getting tired.He said，"9 don't you put down your telephone？Perhaps she is trying to 10you now.

    "The hound of Baskervilles" is a legend which tells us that a hound used to kill people in the Baskervilles family. Sherlock Holmes is good at searching and discovering. He is a very careful person as well. In the stories, he can quickly give you the explanation of the things happened just now. Sherlock Holmes is such a person.

    Sherlock Holmes wants to know more about it because Doctor James asks him for help. During the case, Charles Baskervilles dies and the cause of his death may be the hound. After watching the situation in a small house for some time, Holmes finds the murderer and he is going to murder Sir Henry Baskervilles. Sherlock Holmes, Doctor Watson and Henry Baskervilles kill the hound at last and the murderer(凶手) who wants to get the money of the family finally dies in the marsh(沼泽地).It is a very exciting story shows how clever Sherlock Holmes is. Thanks to Konan Doyle, we can read a lot of good detective stories now.