A lot of boys and girls in western countries are wearing the same kind of clothes, and many of them have long hair, so it is often difficult to tell whether they are boys or girls.

    One day an old man went for a walk in a park in Washington and when he was tired, he sat down on a chair by a swimming pool. A young person was standing on the other side of the pool.

    "Oh!" the old man said to the person sitting next to him. "Do you see the person with the loose clothes and long hair? Is it a boy or a girl?"

    "A girl," said his neighbor. "She is my daughter."

    "Oh!" the old man said quickly. "Please forgive me. I didn't know that you were her mother."

    "I'm not," said the person. "I'm her father."

     Nancy is an English school girl. She studies in a middle school. She has a little brother. His name is John. John is only four. Nancy likes him very much.

    Today is Sunday. Nancy wants to do her homework. She takes out her pencil-box and opens it. “Oh, dear! Where's my pen?” She can't find her pen. She goes to ask her brother in his bedroom.

   “John! I can't find my pen. Can you see it?  Oh, what are you doing with my pen? ”

   “I'm writing to my friend, Peter.” John answers.

   “But how can you? You don't know how to write! ”

   “It doesn't matter. Peter can't read. ” John says.

根据短文内容，选择正确答案。

    Qian Xuesen was born in Shanghai on December 11^th, 1911. He is known as "the father of China's space program" and "The king of the rocket".

    When he was 24 years old, Qian went to America for further study. After graduation, he worked in America for a few years, where his working conditions were better. In the early 1950s, he heard New China had been founded(成立) and decided not to stay in America any longer. He succeeded in coming back to his motherland in 1955 though the American government tried to stop him.

    In 1956, Qian Xuesen suggested setting up a special organization, which later became the leading organization for China's rocket and air travel program. In June 1964, China successfully created its first medium rocket. Qian also played an important role in developing China's first man-made satellite(卫星). On April 24, 1970, "Dongfanghong-I was successfully sent into the air."

    In 1964, a young man wrote Qian Xuesen a letter and pointed out a mistake in his published article. Qian immediately answered the letter and encouraged the young man to write an article out the mistake.

    Zhu Yilin, who was said to be the last student of Qian Xuesen, once said, "I learned a lot of professional knowledge as well as the spirit and attitude that a scientist should have from Mr. Qian, especially his deep love for the motherland. Without that, they couldn't have helped to develop science and technology when New China was badly development. Without that, he would not have made the great contribution(贡献)to industry in the late 1950s and early 1960s when conditions in China were too hard

    Mr. Qian has been dead for ten years, but he will live in the memory of Chinese people forever.