Last Sunday, we asked some young people what exercise they did, and here are their answers.

    Jack: I'm afraid I am very lazy. The only sport I do is to play football once a month and do some swimming, but only in summer. Every day, I am busy in studying.

    Ted: About once a week, I go running. I run about 5 kilometers. In winter, I go skiing(滑雪) when I have time. But every morning, I just do some easy exercise.

    David: I often do some sports at school or outside school. My mum makes me go swimming because I am kind of unhealthy. I began to do gymnastics(体操) 6 years ago. Costing over 600 pounds a year is very expensive for me. And I began to swim 8 years ago. Now I want to stop them because I have much homework. But I am afraid that I will be fat if I stop all the sports.

青藏高原夏季气温比长江中下游低得多，其主要原因是(    )

如图所示是中国航母“辽宁号”训练时舰载飞机飞行的图片．下列说法中正确的是（　　）

根据内容完成Sally's family tree.

    I'm Sally, I'm a student in No.14 Middle School. This is my family tree. You can see it is a big family. My father is Jonathan, my mother is Claire. They have three children. My brother's name is William and my sister's name is Olivia. My grandparents Jerry and Elizabeth have two sons. My uncle Mike and my aunt Sarah have a son, his name is Joseph. He is my cousin. He is four years old. We all love him very much.

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