In America，primary school lasts six years. There are about twenty students in one class. They are in different groups. Different groups may have different textbooks. The whole grade graduate(毕业)at the same time，but the students learn different knowledge.

    Primary school students don't have schoolbags. Their books are in the school. The students usually study reading，arithmetic(算术)，language，science，music，art and PE. The performances(成绩)show three grades. G means good. S means satisfaction. N means you need to work hard.

Jack's dog Tony

    One day Jack and David went fishing. Jack took his dog Tony with him. On the river back, when the dog saw a bird, he would run after it and try to catch it. "All the fish are frightened and swim away," said David. " Be quiet, Tony," Jack shouted at the dog. But Tony did not listen to him. "Shall we go home now, David?" said Jack. "Next time I shall not bring him here again."

"Wait," said David. "A fish is biting my line." "Look out!" shouted Jack. But it was too late. The boy fell into the water. "Help!Help!" David shouted. But Jack couldn't swim, either. Just then Tony came out! He jumped into the water and pulled the boy onto the bank and saved his life.

    Mrs. Black's mother was ill in bed three days ago . So she had to go and look after her .

    Before she left , she said to her husband , “I must tell you where everything is , or you don't know what to do , but my train is leaving in half an hour's time and I must go now .”

    “Don't worry ,” Mr Black said , “ I can look after myself .” In fact , he could not do anything without his wife . But when his wife came back the next day , she did not have to wash any plates because he had his metals in restaurants .

    A French student goes to London for his holiday. He knows a little English, but he can't speak very well.

    One day he goes to a restaurant. He wants to have some eggs, but he can't remember the English word for "egg". He looks around and sees a picture of hen. He shows the picture to the waiter. "What do you call her children?" he asks. "Chicks, sir." "And what do you call chicks before they're born." "Eggs, sir." "Very well," says the French student. "Bring me two eggs and a cup of milk."

根据短文内容，选择正确答案。