【推荐2】If you look at a house from far away, you might see some of its features, such as doors and windows. If you go nearer to the house, you might find that it is made of bricks. When you look closely, you can see that the house is made of many bricks.

The bricks are the building blocks (块) of the house.

Your body has building blocks too. They’re called cells. The bodies of plants and animals are very different from one another, but they all have one thing in common—all are made up of cells. There are many different kinds of cells in your body. Each kind of cell has its own job, such as muscle (肌肉) cells, bone cells, and blood cells.

Cells work together to keep your body alive. A group of similar cells that work together to do the same job form a tissue (组织). The human body is   made of different kinds of tissues. Muscle tissue and nerve (神经) tissue are two kinds of tissues.

An organ is a group of different kinds of tissues that work together to carry out a certain job. Each kind of organ in your body has a special job to do. Some examples of organs are your stomach, heart and skin.

Like cells and tissues, organs work in groups too. A group of organs that work together to do a certain job is called an organ system (系统). All the organ systems in your body work together to keep you alive. These systems can be put into the two groups—Support and Control Systems as well as Energy and Transport Systems.

【推荐2】Rick: I live in Chengdu and I go to No.3 Middle School. I go to school by bike every day, because the roads (路) in Chengdu are nice and it is easy for me to ride a bike. But sometimes when it rains (下雨), I take a bus to school.

Joe: My name is Joe Smith. I’m from Miami, the USA. I take the school bus to school and it’s easy for students. After school, I still take the school bus home. What about you?

Carol: My name is Carol. I live in a village in Yunnan. Truly speaking, I don’t really like going to school, because my school is far from my home. And there are two rivers between my home and school. I need to take a boat to school.

Julie: Hi, I am Julie. I live in Beijing. My parents are teachers in a middle school and I’m a student in their school. Every morning, my father drives my mother and me to school. And after school, my father drives us home.

【推荐3】Mrs. Green has a little dog. Its name is Carl. It is very clever (聪明). It often helps her buy (买) a newspaper (报纸). One winter evening, the dog goes out to play. It is snowing (下雪) heavily. Soon the ground (地面) becomes white. “The dog never lost his way. Where’s he now?” Mrs. Green thinks. She shouts his name. But still the dog doesn’t come back. So she telephones the police (警察) and tells them a lot about her dog.

“My dog is very clever. He always comes out and comes back soon. Sometimes he plays with his friend Mickey. He can buy a newspaper. He almost (几乎) talks.”

The policeman is tired and says, “I think you’d better (最好) put your telephone down. Maybe he is trying to telephone you now.”

【推荐1】More and more Chinese people like take-away food(外卖食品). They are usually busy with work and don't have time to cook meals after work. So take-away food becomes more and more popular. There are many different kinds, such as fried chicken, hamburgers, fish and chips. They are all delicious. People usually drive to restaurants and buy some. Then they take them to their workplaces or their homes.

Chinese people usually have a big meal on weekends. The family get together and go out to a restaurant. Some people like to stay at home. They cook for themselves. They like watching TV or talking about funny things while eating.

【推荐3】The coldest and most difficult place in the world in which to live is Antarctica (南极洲). Antarctica is the land of snow and ice near the South Pole (南极). Most people do not think there is much life in the icy water around it. They are wrong.

Antarctica’s seas are full of life. There are many kinds of fishes, water birds, seals and whales. They eat the plant life in the sea and the smaller water animals. Some whales, for example, eat more than a ton (吨) of food every day.

The most famous animal of Antarctica is the penguin. It walks around the icy beaches as if it were a movie star walking down the street.