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.

    This is a big supermarket(超市). It's near my home. In this super-market you can buy many things, such as (例如) hot dogs, cakes, apples, oranges and eggs. And you can buy school things, too. The super-market opens early(早) in the morning, and closes late in the evening.

    My mother and I often buy things in this supermarket. I often buy some school things like pens, pencils, exercise (练习) books, and my mother often buys some fruit and vegetables.

阅读短文，判断正误。

    I went to the beach in Haikou last Sunday. It was sunny. The air was fresh and the water was clean. There were a lot of people on the beach.

    Some girls sang songs near the sea. Some boys played volleyball on the beach. I saw a cat in a big tree. An old man listened to the radio on a long chair. Some young men swam in the sea. There weren't any ships on the sea.

    Tom was a very lazy boy when he was eleven years old. He didn't like doing anything. He had to go to school on weekdays, but he didn't study hard in the class and didn't do any homework after school. His father and mother were both doctors, and back then they hoped Tom could become a doctor, too. But one day, Tom said to his mother, "When I finish school, I want to be a cleaner." "A cleaner?" his mother asked. "That's not a very good job. Why do you want to become a cleaner?" "Because then I would only have to work one day a week," Tom said happily. "Only one day a week?" his mother was very surprised. "Why do you say that? And how do you know?" "Well," Tom said, "I know that the cleaner comes to our house to work only on Thursday because I see her only on that day."

    This is the earth. The green part is land. The blue part is sea. The white part is clouds. Our earth is very beautiful and interesting. Many years ago, the earth is very clean. But nowadays there is much pollution on the earth. People are polluting the land, the water and the air. People must stop doing that. We must protect the earth.

    My grandfather is fifty-five years old. He's a policeman. He loves his job very much. It is Sunday. Today is his birthday. My father, my mother and I are in his home. My uncle also comes here. He's a tall man. He's a doctor. He comes to see my grandfather every Sunday. My grandfather has a good friend. His name is Jim. He's from England. He's an artist (艺术家). He comes to see him, too. My grandfather is very happy today.